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Building Blocks of Creation

Across
At least two or more atoms bonded together
Neutrally charged part of an atom (located in the center)
Negatively charged part of an atom
Smallest particle of an element giving that element its properties
Down
Positively charged part of an atom (located in the center)
Pure substances (a group of all the same atoms)
The element with the smallest atom (#1 on the Periodic Table of Elements)
Two hydrogen atoms bonded with one oxygen atom: H2O