Which element does not have the same number of electrons in its outermost shell as the other elements in its group?(1 point)
hydrogen (H)
bromine (Br)
boron (B)
helium (He)
Answers
Answer:
The answer is helium (He)
Explanation:
Because helium is in the group 18, and the other elements of group 18 have 8 electrons in it's outermost, while helium just have 2 electrons
Helium (He) does not have the same number of valence electrons as other elements in its group.
The periodic table is divided into groups with the last number of the group coinciding with the number of electrons that an element in the group has in its outermost or valence shell.
Helium is in group 18 which means that it should have the same number of valence electrons as :
NeonArgonKryptonXenon and,RadonYet Helium only has 2 valence electrons. We can therefore conclusively say that Helium does not have the same number of valence electrons as other elements in its group.
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Related Questions
What is the minimum value of force acting between two charges placed at 1 m apart from each other?
(a)Ke²
(b)Ke
(c)Ke/4
(d)Ke² /2
Answers
Answer:
Ke²
Explanation:
So,
q1 = e
q2 = e
r = 1m
By coulumb's law,
F = K (q1q2/r²)
F = K (e)(e)/(1)²
F = Ke²
Option(a)
Help please with question 2bii
The one that starts with calculate the average ....
Answers
Answer:
add text fully or atleast add book name edition . solution is in picture. chk pictures ignore b part
Explanation:
what is linear expansivity
Answers
What mechanism of energy is transferred by mass motion of fluid from one region of space to another?
Answers
If the force on a spring is 2 N and it stretched 1 m, what is the spring
constant?
A. 0.4 N/m
B. 0.2 N/m
C. 2 N/m
D. 4 N/m
Answers
C) 2N/M
The formula is F=ke
where F = force,k= spring constant and e=elasticity
2=k*1
k=(2/1)
k=2N/M
We know
[tex]\boxed{\sf Spring\:constant(k)=\dfrac{F}{x}}[/tex]
[tex]\\ \sf\longmapsto k=\dfrac{2}{1}[/tex]
[tex]\\ \sf\longmapsto k=2N/m[/tex]
In the two-slit experiment, the distance between the slits and the screen is 1.15 m and the distance between the slits is 0.100 mm. If the first-order bright fringe is measured to be 4.2 cm from the centerline, what is the wavelength of light?
Answers
D = 1.15 m (distance of slots from
screen)
d = 0.100 mm
10^-4 m (distance between the two slits)
m = 1 (first order bright fringe)
xm = 4.2 cm
0.042 m (distance of first order bright fringe from centreline)
We know that,
xm = m* D λ/d (λ= wavelength)
0.042 = 1* 1.15 λ/10^-4
λ = (0.042 * 10^-4)/1.15
Therefore,
λ = 0.0365 * 10^-4
3.65 * 10^-6 m (approx)
the splitting of white light into its constituent colours is called
Answers
How much power does it take to lift a box with a weight of 50N to put it on a shelf that is 10m high in
10 sec?
Answers
We know
[tex]\boxed{\sf Power=\dfrac{Work\:done}{Time}}[/tex]
[tex]\\ \sf\longmapsto Power=\dfrac{Force\times displacement}{Time}[/tex]
[tex]\\ \sf\longmapsto Power=\dfrac{50\times 10}{10}[/tex]
[tex]\\ \sf\longmapsto Power=\dfrac{500}{10}[/tex]
[tex]\\ \sf\longmapsto Power=50W[/tex]
Invisible damage to the body resulting from repeating a movement often is a
Answers
Explanation: The repetitive strain injury (RSI), also known as overuse syndrome, is defined as the invisible damage to the body resulting from repeating a movement. These type of damage can affect the muscles, nerves, ligaments and tendons.
A rabbit runs a distance of 60 meters in 20s. What is the average speed?
Answers
Answer:
3 m/s
Explanation:
Given,
Total distance = 60 m
Total time = 20 s
We know that,
Average speed = Total distance/Total time
=> Average speed = 60 m/20 s
=> Average speed = 3 m/1 s
=> Average speed = 3 m/s
Average speed=Total distance/Total time
[tex]\\ \sf\longmapsto Average\:Speed=\dfrac{60}{20}[/tex]
[tex]\\ \sf\longmapsto Average\:Speed=3m/s[/tex]
An action force is 75 N up. The reaction force must be:
!ASAP!
Answers
The reaction force must be:
75 N up
a bus moving with acceleration 2m/s^2. What does it mean
Answers
Answer:
a bus moving with acceleration of 2 meter per second square
Answer:
It means that it's velocity is 2m/s per s
Means it travels 2m in 1st second and 4m in 2nd sec
Dos ciclistas se encuentran compitiendo en un velódromo. Considere que el peso de cada ciclista es W1 y el peso de cada bicicleta es W2. En el instante en el que los dos ciclistas se encuentran uno al lado del otro, es correcto afirmar que:A. Las velocidades de ambos ciclistas son iguales B. Las posiciones y las velocidades son iguales C. Las posiciones son las mismas D. Las posiciones como las aceleraciones son iguales
Answers
Comenzemos con unas definiciones.
La posición nos dice la ubicación espacial de un dado objeto.
La velocidad nos dice como cambia la posición a medida que pasa el tiempo.
La aceleración nos dice como cambia la velocidad a medida que pasa el tiempo.
Teniendo esto en cuenta, la respuesta correcta La respuesta correcta es la opción C: "Las posiciones son las mismas"
Para poder entender esto, podemos desarrollar:
Ahora, supongamos un ejemplo.
Sea una persona caminando y un auto yendo en la misma dirección, de tal forma que la persona comienza varios metros delante del auto.
A medida que el auto aumenta su velocidad, eventualmente se encontrara al lado de la persona.
Naturalmente, es fácil darse cuenta de que tanto la velocidad como la aceleración del auto serán mayores que las de la persona, pero la posición (almenos en una dimensión) será la misma.
Podemos interpolar esto a cualquier situación similar, sabemos que para dos objetos que estén al lado del otro la posición será la misma, pero sin más contexto no podemos concluir nada sobre la relación entre las velocidades y las aceleraciones.
Con esto en mente, la respuesta correcta es la opción C: "Las posiciones son las mismas"
Si quieres aprender más sobre el tema:
https://brainly.com/question/17123407
what is the unit of power?
Answers
Answer:
Explanation:
The unit of power is watt .
If the force of attraction btw earth and us is equal n opposite then why is the net force zero and if it is zero why do we get pulled towards earth
Answers
Answer:
Explanation:
It's not equal and opposite. You're thinking of Newton's 3rd Law. This is not that. This is gravitational attraction between 2 objects. We can figure out mathematically the pull that the earth has on a single person, by using the equation for gravitational force and the universal gravitational constant, G:
[tex]F_g=\frac{Gm_1m_2}{r^2}[/tex] where G is the universal gravitational constant, m1 is the mass of one person, m2 is the mass of the earth, and r-squared is the addition of the radius of the earth plus the radius of you in relation to the surface of the earth.
Let's say a person weighs 150 pounds; in Newtons this is 667 N (rounded from 667.233); his mass then, in terms of the metric system (using 9.8 for gravity), is 68.2 kg. Let's also say that this person is 6 feet tall. 6 feet is the same as 1.83 m (rounded to 3 sig fig's) and the radius from that person's center to the surface of the earth would be about half that height at r = .915 meters. Filling in the formula:
[tex]F_g=\frac{(6.67*10^{-11})(68.2)(5.98*10^{24})}{(6.38*10^6)^2}[/tex] it turns out that the person's radius adds nothing significantly to the radius of the earth, so it doesn't even count mathematically. It's way too small compared to the earth's radius (which is the denominator of that equation). We find that
[tex]F_g=668N[/tex] That's the pull that the earth has on that person which, not coincidentally, is the weight in pounds we said that the person was. Isn't physics amazing!?
In a simple machine the energy input is 120J if the efficiency of the machine is 80% calculate the energy output
Answers
Answer:
E_O = 96J
Explanation:
E_O = E_I*(%e/100%)
E_O = 120J*(80%/100%)
E_O = 96J
the slope of a line on a position vs time graph is the
a. velocity
b. time
c. distance
d. displacement
Answers
It's the velocity, but only the magnitude. It can't show the direction of the velocity. So it's better to call it speed.
think about the objects which acts as concave or convex Mirrors in your surroundings write a report on it
Answers
Answer:
Explanation:
S.No Concave Mirror Convex Mirror
1. Dentist's mirror Rear view mirror of vehicles
2. Shaving Mirror Streetlights
3. Headlight of vehicles Water glass surface
4. Caving side of spoon Curving side of spoon
5. Torch glass Electric Bulb
6. Inner surface of Outer surface of steel basin
steel basin
7. Lunch plates Calling bell
8. Microscope Optical instruments
9. Satellite dishes Fish eye lenses
Rahul is carrying a load of 80 kg along a distance of 200 meters in 5 minutes. But the same load is carried by Reena to the same distance in 4 minutes. Who has more power? Also show by calculation.
Answers
Answer:
REENA IS STRONGER
Explanation:
so let's just find how long each person takes to carry the load half way, to proof who is stronger.
Rahul takes 5 minutes
5/2
= 2.5
so Rahul takes 2.5 minutes to travel 100 metres with 80 kg
where as
Reena take 4 minutes
4/2
= 2
so Reena takes 2 minutes to travel 100 metres with 80 kg
__________________________________________________
Therefore Reena is stronger because, she went 30 seconds before Rahul
Answer:
hope it helps you
Explanation:
fonot judge through bad handwriting :(
use the periodic table to answer the question
which statement correctly compares the number of protons and electrons in atoms of rubidium (rb) and calcium (ca)?
A.rubidium has more protons and fewer electrons than calcium
b. rubidium has more protons and more elctrons than calcium
c.rubudium has fewer protons and more electrons than calcium
d. rubidum has fewer protons and fewer electrons than calcium
Answers
Answer: I hope this helps you
Explanation:
Answer:
B. Rubidium has more protons and more electrons than calcium.
Explanation:
In a simple machine the energy input is 120J if the efficiency of the machine is 80% calculate the energy output
Answers
Answer:
24J
Explanation:
The energy output will be the 20% it lost in efficiency:
120-80% = 24J
What is not one of the main uses of springs?
A. Bike suspension
B. The seasons
C. Clock making
D. Car suspension
Quick answer
Answers
Answer:
b. the seasons
Explanation:
In nonequilibrium, total counterclockwise moments = total clockwise moments. *True False
Answers
Answer:
[tex]{ \bf{false}}[/tex]
Explanation:
Because it breaks the law of moments.
Hello,Plz Help Which conditions are necessary for rain to form?
The temperature of the air below the cloud is above freezing.
The temperature of the air below the cloud is below freezing.
The sky has no clouds, and the temperature of the air is cold.
There is a warm layer of air and a cold layer of air closer to the ground.
Answers
The third one makes no since because the clouds carry the rain. It isn’t always cold when it’s going to rain
The fourth one is a good one
The second one again it’s not always cold when it’s raining
The first one could be it also
Hmmm I would go with the last one
Sorry if it’s wrong
The option There is a warm layer of air and a cold layer of air closer to the ground. is the correct answer
the moon revolves around the earth in a nearly circular orbit kept by gravitational force exerted by the earth work done will be
Answers
Answer:
Zero because the applied force is perpendicular to the motion of the object.
No work is done on an object moving is a circular path about a central attractive force.
Any work done in such a case would result in a change in the orbit.
if the velocity of a train starts from rest is 72km/h(20m/s) after 5 minutes, find out its acceleration and the distance travelled by the train in this time
Answers
Explanation:
Convert the time to seconds : 5minutes × 60 = 300seconds
Acceleration = Velocity / Time
Acceleration = 20m/s / 300s
Acceleration = 0.067m/s²
Distance = Velocity × Time
Distance = 20m/s × 300seconds
Distance = 6000m
A bird flying 5.0 m overhead sees me drop it, and starts to dive straight down towards the bread the instant I release it. She catches it after it falls 3.0 m. Assuming she accelerates constantly from rest (0 = 0) at the time I let go of the bread, what is her acceleration?
Answers
Answer:
15
Explanation:
muntiply the 5.0.3.0 ,you will get ans
anyone who is in class 6?
Answers
Answer:
hey I am in class 6 why did you ask
if A vector = i^-j^+k^ then unit vector in the direction of A vector
a)√3,j^
b)(i^-j^+k^)
c)(i^-j^-k^)/√2
d)(i^-j^+k^)/√3
plzz answer my question with explanation
Answers
If A = i - j + k, then the magnitude of A is
||A|| = √(1² + (-1)² + 1²) = √3
Then the unit vector in the direction of A is 1/||A|| multiplied by A :
u = A/||A|| = (i - j + k)/√3
(choice D)
explain radiation and which is the hotest source in the world
Answers
Ramsar has the highest level of natural radiation in the world.
Hot springs located in the Arkaroola Wilderness Sanctuary in Southern Australia are also credited with higher than normal radiation levels, due to spring water coming in contact with rocks rich in uranium and radon.
