Size, Reactivity, Periodicity
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4Unit 5.3 Size, Reactivity and
Periodicity
Teacher: Dr. Van Der Sluys
Objectives
• Formulas of some nonmetals
• Ions
– Cations
– Anions
– Periodic relationships
– Activities
– Relative sizes
Formulas for Elements
• Monatomic - Group 18 Noble gases
– He, Ne, Ar, Kr, Xe, Rn
• Diatomic Elements
– H
, N
, O
, F
, Cl
, Br
, I
2
2
2
2
2
2
2
• Elements with other formulas
– P
, S
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8
• Metals do not have distinct formulas, but are
simply represented by writing the atomic
symbol for that element.
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