Entropy worksheets
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Ionic bonds form between ---
nonmetals.
metals and nonmetals.
Covalent bonds form between ---
nonmetals.
metals and metals
metals and nonmetals
What are valence electrons?
sum of the protons and neutrons
protons minus electrons
electrons in the inner shells
electrons in the outer shell
Atoms that gain an electron have an electric charge of ---
-1.
-2.
+1.
+2.
If an atom has 7 protons and 7 electrons, its electric charge is ---
-7
-14
0
+7
Atoms form compounds to become more ---
reactive
stable
explosive
toxic
Atoms gain lose, gain, or ______electrons to get a stable outer energy level.
share
split
create
destroy
A _______ is the force that holds atoms together in a compound.
Chemical Formula
Chemical Reaction
Chemical Bond
Synthesis Reaction
An atom with a different number of electrons than it should have (more or less) is called an ---
isotope
valence electron
ion
octet
Which of the following is NOT a covalent bond?
K2S
H2O
I2
CO2
Which of the following is NOT an ionic bond?
NH3
KCl
K3N
NaCl
Why do chemical bonds form?
so the number of protons equals the number of electrons
to fill the outermost electron level
so an atom can become unstable
An electron has a ___ charge.
no charge
positive
negative
it depends
A proton has a ___ charge.
positive
negative
no charge
it depends
According to the Octet Rule, atoms of elements react with each other in order to attain ____ electrons in their outermost energy level or shell.
2
4
8
10
An atom of Neon complies with the Octet Rule because it has ___ electrons in its outer shell.
10
8
2
7
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