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Atomic Number, Mass and Isotopes

Name:
Date:
Period:
Across
The core of an atom.
Atoms of the same element that have different masses
The ancient scientist that first came up with the idea of the atom.
The number of protons in the atom of an element.
The number of protons and neutrons in the nucleus of an atom.
Atoms with a positive or negative charge.
A substance that cannot be chemically broken down into simpler substances.
This particle has a positive charge and is found in the nucleus of an atom.
Down
This particle has a neutral charge and is found in the nucleus of an atom.
The mass of the protons and neutrons in the nucleus of an atom.
The father of modern atomic theory.
The simplest atom.
The average mass an atom is found at.
The smallest portion of an element that can be identified as that element.
This particle orbits around the nucleus of an atom.