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As Smart As A Chemist

Across
Subatomic particle that is not part of the mass of the atom.
The number of protons in an atom.
Atom with 17 protons
Law that states that matter is neither lost or destroyed.
Identifies an atom
Down
Element with 2 valence electrons on the 4th energy level.
Identifies the reactivity of an atom
An atom has 13 protons, 13 electrons and 14 neutrons. What is the mass of the atom?
Atom with 14 neutrons
Element with less mass but the same reactivity as potassium