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Mass number= is the number of protons (p+) and neutrons (n0).

Mass number = the number of particles that contribute to the mass of the atom.

Nucleon: a subatomic particle that is found in the nucleus.

Mass number = number of nucleons in the nucleus (p+ / n0)

Its symbol is A

A= Z+N (main)

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The number of protons and neutrons in the nucleus or the number of nucleons (particles in the nucleus).

Z=4

N=3

A=Z+N=4+3=7

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Elements can be found on the periodic table

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It has a nucleus in the center that contains protons and neutrons

And the outer electron cloud around the nucleus that contains electrons

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Protons have a positve charge (P+)
Electrons have a negative charge (e-)
Nuetrons have a nuetral charge (N0)

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Protons
Electrons
Neutrons

-The number of protons and electrons is equal
-Protons and Neutrons cluster together in the central part of the atom

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An atom is the smallest unit of matter that contains all the chemical properties of an element.

Atoms are the building blocks of matter- all substances are made up of atoms

They are microscopic