Happy Atoms Worksheet Page 13
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33Periodic Trends Worksheet
Except for hydrogen and helium, most elements want to fill their orbitals so that they have a stable Octet (8 electrons in their outermost
shell). Atoms do this by bonding to other atoms. Review the Happy Atoms app or physical models for each atom listed below to determine how many
valence electrons each atom has and how many it needs.
Number of
The number of electrons an
Total Number of Valence
Chemical
Inner
Number of Valence
element will donate or lose in
Electrons in a Stable
Symbol
Electrons
Electrons
order to achieve stability
Configuration
H
1
He
2
Stable
Li
2
1
Be
C
N
O
Needs 2 more electrons
F
7
Ne
Na
Mg
10
Si
P
S
Cl
Ar
1. Write one sentence below describing how electronegativity changes as you move from left to right on the periodic table.
2. Write one sentence below describing how electronegativity changes as you move down a group on the periodic table.
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