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Elements thing

Across
2 elements or atoms combined
This element has the lowest atomic mass
Another name for chart
Electrons revolving around a nucleus
The smallest unit that makes all matter
______ is best known for being lighter than air
The largest subatomic particle
Down
The base element of all living things
The 17th/7th group on the table
Substance which cannot be further broken down (spelled backwards)
Positively charged particles
The _____ table (spelled backwards)
There are __ groups on the perioic table (written as word)