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ATOMS

Across
A high-energy electron that comes from the nucleus
The release of nuclear particles and energy
Positively charged particles
Consists of two protons and two neutrons
Atoms of the same element that have different number of neutrons
A piece of metal that conducts electricity and has a negative charge
Down
The number of neutron plus protons
Negatively charged particles
A piece of metal that conducts electricity and has a positive charge
The number of protons in the nucleus of an atom of that element
The changing of one element into another through radioactive decay
Neutrally charged particles
Matter made of atoms of only one kind