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Building Blocks of Matter

Across
H
Has a minus charge
Two or more atoms chemically combined
Substances of which matter is composed
Indivisible (smallest that still retains properties)
Study of life
Ability to do work
Consists of only one type of atom
Neutral charge
Down
In every atom
Has mass and occupies space
Add or sub electron creates ________
Has positive charge
Cl
Means part of
Study of relationships in the environment
Na
O
One part Oxygen & two parts Hydrogen
Elemental _________