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atomic structure

Across
_______ number is also know as the mole.
A unit for counting a large number of small particles.
Contains protons and neutrons
Equal to the number of protons in an element.
The ______ force holds an atom together.
Sub atomic particle with no charge.
Positively charged sub atomic particle.
The mass in grams of 1 mole of a substance is called _______ mass.
Down
A particle of light.
These electrons are found in the outer energy level of an atom.
Number of protons plus number of neutrons of an element.
A charged atom.
The average atomic mass is a _______ average.
Negatively charged sub atomic particle.
An element that varies in mass because its number of neutrons differ.
A region in an atom where there is a high probability of finding electrons.