Answer:
The correct option is;
D. All the elements in families 1 and 2 can place all their shell electrons in the s sub-level
Explanation:
The elements in families 1 and 2 also called the group 1A and group 2A elements are known as the alkali and alkaline earth metals. The elements in the families 1 and 2 are also referred to as the s-block elements as they have their valence electrons which are 1 and 2 respectively, in the s-orbital or s sub-level
Due to their low ionization energy, and the ease with which they donate their valence electrons, elements of the families 1 and 2 are known to be very reactive, and are found in a combined state in nature.
What side is the products
Please help me with this thank you !!
How is the crust and the inner core alike
Answer:
They are both solids
Explanation:
I had to answer that question a long time ago hope this helps.
what would decreased the resistance of wires an electric current
Answer:Thicker wires have a larger cross-section that increases the surface area with which electrons can flow unimpeded.
Explanation:I really do not know
which is the correct answer??
Answer:
1
Explanation:
what is the number of atoms in 1 mole of carbondioxide??
Answer:
6.02×10 to be tge power 23
An atom of which element has the strongest attraction for electrons in a chemical bond?
A) chlorine
B) nitrogen
C) oxygen
D) selenium
Answer:
Fluorine. This element has the greatest electronegativity value, so has the greatest attraction to electrons in a bond.
Explanation:
The atom of element with the strongest attraction for electrons in a chemical
bond from the options is Chlorine.
The element with the strongest attraction for electrons in a chemical bond is
the most electronegative element.
The electronegativity of an atom is the tendency of an atom to attract
bonding pairs of electrons.
Generally, electronegativity of an element increases across the period. The
electronegativity of an element also decreases down the group. The most
electronegative element is fluorine.
Halogen group are naturally electronegative.
Therefore, the most electronegative element in the option is chlorine and its
the element that has the strongest attraction for electrons in a chemical
bond.
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If the mass of the Crown is 505431 mg, and volume is 44 mL, what is the density of the Crown? Was the Crown solid gold? (the density of gold is 19.3 g per cubic centimetre.)
Answer:
11.49g/cm³
The crown is not gold
Explanation:
Given parameters:
Mass of crown = 505431mg = 505.431g
Volume of crown = 44mL = 44cm³
Unknown:
density of the crown = ?
Solution:
Density is the mass per unit volume of a substance.
Density = [tex]\frac{mass}{volume}[/tex]
insert the parameters and solve;
Density = [tex]\frac{505.431g}{44 }[/tex] = 11.49g/cm³
The density of gold is 19.3g/cm³.
The crown is not gold
Which phrase best describes bronze?
a copper–tin alloy
an ionic compound of copper and tin
a pure metal
a mineral ore containing copper and tin
Answer:
a mineral ore containing copper and tin
Answer:
Copper-tin alloy
Explanation:
just took the test :D
the law of conservation in mass
Look up and compare the ionic radii of In3+, Mn3+, and Y3+ for a specific coordination number. Why do you think Mn3+ forms a solid substitution on the In3+ rather than the Y3+ site?
Answer:
See explanation
Explanation:
Substitution implies that one thing is repalced by the other.
Substitution of one ion by another largely depends on the sizes of the ions in question.
The ionic radius of Mn3+ is about 0.65 Angstroms while that of In3+ is about 0.94 Angstroms. On the other hand, the ionic radius of Y3+ is about 1.032 Angstroms.
It is clear that the sizes of Mn3+ and In3+ are closer to each other hence Mn3+ can substitute for In3+ easily than Y3+ in a lattice site.
The larger size of Y3+ explains why it is not easily replaced by Mn3+.
HELP ME with THIS I am time i have a little bit of time and still have more questions !!! CHEMISTRY!!
Answer:
1. is B 2. is C or B
Explanation:
does anyone else simp for mhanifa?
Answer:
i dont XD
Explanation:
Answer:
no
Explanation:
PLZ HELP CHEMISTRY SUCKS BRO
Answer:
just click any of the buttons
Answer:
23535
Explanation:
ugggguguygiugiugugiyuuigiuyiugy
can someone pls help me with this!
Answer:
weathered rock and deceomposed material
Explanation:
can anyone do this. i dont get it
If you have 0.95 moles of FeCl3, how many moles of MgCl2 do you produce in the reaction
FeCl3 + Mg --> MgCl2 + Fe?
I REALLY NEED HELP PLEASEEEEE
Question 5 of 5
Carbon has six protons. Which model shows a neutral atom of carbon?
Answer:
its d
Explanation:
Model D shows a neutral atom of carbon as it has 6 protons in the nucleus and 6 electrons in it's orbits.
What is an atom?
An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.
Learn more about atom,here:
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13. Examine the following table, each letter represents a piece of missing information. Below
you will be asked to identify the information to complete certain boxes Copy the letter as
showed under the table with its correct answer. (8 pts)
Name
Symbol
Protons
Neutrons
Electrons
Mass
Oxygen-16
A
18
18
8
E
Chlorine-35
B
18
17
F
35, C
To go
E
F
G
H
Oxygen-18
18
8
Chlorine-37
32, CI
17
20
D
H
Answer: i can understand it sorry
Explanation:
Sorry it’s for science
Answer:
A
Explanation:
Density/Formula
\rho ={\frac {m}{V}}
\rho = density
m = mass
V = volume
Which of the following characterizes the nucleus of every atom?
1. It has a positive charge
2. It is very dense
3. It is composed of protons, neutrons and electrons
a
I and II only
b
I, II and III
c
I and III only
d
II and III only
Balance the foll. equations
Answer:
naf+so2+nho3
Explanation:
beacause sodium is main solution in this equation
Answer:
e) P + O2 → P2O5
balanced equation
4P + 5O2 → 2P2O5
f) NaCl + F2 → NaF + Cl2
balanced equation
2NaCl + F2 → 2NaF + Cl2
g) K + MgBr2 → KBr + Mg
balanced equation
2K +MgBr2 → 2KBr +Mg
h) Mg + O2 → MgO
balanced equation
2Mg + O2 → 2MgO
i) Al + O2 → Al2O3
balanced equation
4Al + 3O2 → 2Al2O3
hope this helps you!
A substance that is composed only of atoms having the same atomic number is classified as
Which of the following is a chemical change?
melting of ice
burning of wood
breaking of glass
Evaporation of water
Answer:
The answer is burning of wood
Explanation:
just took the quiz
In a science experiment 50 grams of salt are placed in a metal pan and are dissolved in 100 mL of water. The water is heated for 3 minutes. What is most likely happening in the pan when the water reaches 100°C?
A. The water will have all evaporated.
B. The water will no longer contain salt.
C. The water will be boiling.
D. The water will be cool enough to pour into a beaker.
Answer:
The water will be boiling
Explanation:
When water reaches 100⁰C the water will be boiling.
What is the ground-state electron configuration of O2-? A (σ2s)2(σ2s*)2(σ2p)2(π2p)4(π2p*)1(π2p*)1 B (σ2s)2(σ2s*)2(π2p)4(π2p*)1 C (σ2s)2(σ2s*)2(σ2p)2(π2p)3(π2p*)2(π2p*)2 D (σ2s)2(σ2s*)2(σ2p)2(π2p)4(π2p*)2(π2p*)1
Answer:
(σ2s)2(σ2s*)2(σ2p)2(π2p)4(π2p*)2(π2p*)1
Explanation:
In writing molecular orbital configuration, the number of valence electrons involved in the molecule are all written into various molecular orbitals in accordance with the Aufbau principle.
O2^- contains 17 electrons. Its molecular orbital configuration is KK(σ2s)2(σ2s*)2(σ2p)2(π2p)4(π2p*)2(π2p*)1. Recall that the inner (σ1s)2 and (σ1s*)2 is designated as KK. This inner shell does not take part in bonding. The bond order in O2^- is 1.5.
The ground state electron configuration of O2- is Choice C: (σ2s)2(σ2s*)2(σ2p)2(π2p)3(π2p*)2(π2p*)2
Discussion:
The molecular orbital configuration is dependent on the number of electrons involved in the molecule.
These are all written into various molecular orbitals as described in the Aufbau principle of electron configuration.
Since O2 contains 16 electrons, when it gains an electron to become O2-;
O2^- contains 17 electrons.
Its molecular orbital configuration is;
KK(σ2s)2(σ2s*)2(σ2p)2(π2p)3(π2p*)2(π2p*)2.It is noteworthy to remember that the inner (σ1s)2 and (σ1s*)2 are represented as KK. This inner shell does not take part in bonding.
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What would happen to the food chain, if all the plants were removed?
Answer: chain reaction there will be no carbon and animals who eat plants will die off
Explanation:
What type of reaction is
Mg + CI -> MgCI2?
A. Double-replacement
B. Synthesis
C. Single-replacement
D. Decomposition
Why is fingerprint identification considered a science?
Answer:
Forensic scientists have used fingerprints in criminal investigations as a means of identification for centuries. Fingerprint identification is one of the most important criminal investigation tools due to two features: their persistence and their uniqueness. A person's fingerprints do not change over time.
Explanation:
why light sometimes changed a material and sometimes doesn’t?
Answer:
When light falls on a material, the energy in its photons can affect the atoms in the material. In some materials, such as metal, the atoms absorb some of the photons so light does not pass through them. In other materials, such as glass, the atoms cannot absorb the photons and light passes through them.
Explanation:
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