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Atom Crossword Puzzle

Across
table of the chemical elements arranged in order of atomic number
number of protons in the nucleus of an atom
Two or more atoms that are bound together and act as a unit in a number of chemical compounds
Chemical element that lacks the characteristics of a metal
sum of the masses of its isotopes, each multiplied by its natural abundance
short representation of a chemical element
name given to a horizontal row of the periodic table
subatomic particle of about the same mass as a proton but without an electric charge
An element whose properties are intermediate between those of metals and solid nonmetals
Down
set of metallic elements occupying a central block
all matter is made up of tiny indivisible particles
where electrons are when they go around the nucleus of an atom
stable subatomic particle occurring in all atomic nuclei
positively charged center of the atom consisting of protons and neutrons
the smallest constituent unit of ordinary matter that has the properties of a chemical element
A substance that cannot be broken down into simpler substances by chemical mean
the total number of protons and neutrons in a nucleus
a stable subatomic particle with a charge of negative electricity