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Chemistry Crossword Puzzle

Across
Two bonds together
The outside shell of the atom
How many protons and neutrons a atom has
A shape of an atom
Found out that atoms are made of mostly empty space.
Two atoms that are together.
The center of an atom.
A pure substance
A particle that cannot be broken down anymore
Positively or Negatively
The electrons on the outside shell
Down
Increases as you go down left on the periodic table
Sharing electrons
Two different elements forming a bond
Measure of the tendency of an atom to attract a bonding pair of electrons
Number of electrons and protons in the atom.
A positively charged subatomic particle.
Give electrons
Neutral subatomic particle
Negatively charged subatomic particle