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The Tail of a List

question 3

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The tail of a list


Definitions:

Atomic Number

The atomic number of an element is the number of protons in the nucleus of an atom, defining the element and determining its position in the periodic table.

First Energy Level

The initial level of energy that an electron in an atom can have, closest to the nucleus.

Electrons

Negatively charged particles that circle around an atom's nucleus.

Ion

Atom or molecule that carries a net charge.

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