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Homework Guide (no spaces)

Elements Crossword Puzzle
Across
Located on the left side of the periodic table.
The positively charged center of an atom
A tool used by chemists to help arrange the elements based on certain characteristics.
Has 83 protons
Has 16 protons
The number of protons found in an atoms nucleus
A negatively charged particle.
Down
Has 55 protons
Has 82 protons
A neutrally charged particle.
Located on the right side of the periodic table
When the atom gives off energy or particles from the nucleus.
Has 28 protons
The building blocks of matter.
1 proton=1 unit, 1 electron=1 unit