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The inner core of an atom.

Dense, small, and positive.
Contains the protons and neutrons. nucleus

Accounts for most of an atom’s mass.

Protons(+)
Protons (+ charge)
Neutrons
Electrons (- charge)
Neutrons (no charge)
Electrons (-)

+1 charge
1 atomic mass unit (1 amu)
Located in the nucleus

0 charge

1 amu
Located in the nucleus
(c) E3 Scholastic Publishing

-1 charge th
1
0 mass ( / 1836 of a proton’s mass)
Located outside the nucleus in orbitals

Identifies each element.

The same value as the number of protons.

The overall charge of the nucleus (+).
The same value as the number of protons (or the

atomic number).

Identifies isotopes of an element.
The sum of protons plus neutrons.

Particles in the nucleus.

Protons and neutrons.

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