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Crossword Puzzle

Across
The simplest part of a substance that retains all of the properties
A particle with a negative electrical charge that orbits the nucleus
Pure substances that can't be broken down chemically
An atom or compound with a net electrical charge
Has 53 protons
Forms when two atoms share one or more pairs of electrons
A subatomic particle with a positive electrical charge
It is used in balloons
the quantity of matter an object has
The simplest particle of an element
Used in a type of coin
Down
A subatomic particle with no electrical charge
A chemical attachment between atoms
The number of protons in an atom
A bond formed by electrical attraction
It is used in salt
A pure substance that is made up of atoms of two or more elements
The core of protons and neutrons
The eighth element
anything that takes up space