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WorksheetsChemical Bonds
Total questions: 68
Worksheet time: 2hrs 3mins
All but Hydrogen and Helium want how many valence electrons?
1
2
8
0
When atoms bond it is called a ___________________ because they make a new substance.
chemical reaction
physical reaction
Covalent Bonds ______________ valence electrons.
give
take
keep
share
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
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
Which of the following describes covalent bonds?
Bonds form because of opposite charges
electrons are shared to fill outer electron shells
Electrons are transferred between atoms
Covalent bonds are magical
What is the difference between elements and compounds?
they are the same
elements make up compounds
compounds make up elements
compounds are made of the same type of atoms while elements are mad up of two or more types of atoms
If an atom gains an electron, what charge will it have?
positive
negative
neutral
Where is most of the mass of an atom found?
nucleus
electron cloud
atomic number
mass number
How many total electrons can the 2nd shell or energy level hold?
1
2
8
18
What happens to the valence electrons of an atom when it is a covalent bond?
transfers electrons
shares electrons
does nothing
What happens to the valence electrons of an atom that uses an ionic bond?
transfers electrons
shares electrons
nothing
Which of the following is an ion?
Na
C
O
Na+1
On the periodic table, carbon is in group 14, period 2. How many valence electrons does carbon have?
6
14
2
4
A pure substance that contains 2 or more elements that are chemically bonded.
an atom
an ionic bond
organic
a compound
What happens to electrons in an ionic bond?
they are shared equally between atoms
both atoms in the bond lose electrons
both atoms in the bond gain electrons
one atom gains electrons and the other atom loses electrons
Groups 1, 2 and 13 on the periodic table contain elements with atoms that lose valence electrons and become _____ charged.
equally
negatively
positively
neutrally
Dot diagrams represent ____.
outer shell electrons
protons
neutrons
all electrons
What group will rarely form compounds because they are stable atoms?
18
1
2
17
Which element only needs 2 valence electrons to be stable?
Oxygen
Nitrogen
Hydrogen
Neon
What type of chemical bonds are between metals and nonmetals?
ionic bonds
covalent bonds
metallic bonds
