c02a01 Elements and Valence
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1.  Match the element with the correct symbol. *
10 points
C
H
O
N
P
S
Ca
K
Na
Mg
Hydrogen
Calcium
Nitrogen
Potassium
Magnesium
Carbon
Sulfur
Sodium
Oxygen
Phosphorus
2.  The atomic number represents the number of protons found in the nucleus of the atom and is unique to each type of atom.  In an electrically neutral atom, the number of protons equals the number of electrons; therefore, the atomic number also indicates the number of electrons found in the electron shells surrounding the nucleus. Match the element with the correct atomic number. *
11 points
6
1
8
7
15
16
20
19
11
12
92
Sodium
Phosphorus
Calcium
Potassium
Uranium
Sulfur
Magnesium
Hydrogen
Carbon
Oxygen
Nitrogen
3.  The four elements below make up about 96% of all living things and interact by forming covalent bonds with each other. Covalent bonds result when valence electrons are shared between atoms.  The valence number of an atom refers to the number of electrons needed to fill its valence shell.  Match the element with the correct valence number. *
4 points
4
1
2
3
Nitrogen
Carbon
Oxygen
Hydrogen
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