Protons, Neutrons, and Electrons How Atoms Differ

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Lesson Outline

LESSON 2

Protons, Neutrons, and Electrons--How Atoms Differ

A. The Parts of the Atom

1. Protons and

have about the same _________________.

2.

have much less mass than the other two particles in an atom.

B. Different Elements--Different Numbers of Protons

1. The number of protons in an atom of an element is the element's _________________.

2. Different elements contain different numbers of

.

3. In a neutral atom, the number of number of charges.

equals the number of protons because the charges must equal the number of positive

C. Neutrons and Isotopes

1. numbers of

are atoms of the same element that have different .

2. The total number of of the atom.

3. The

and neutrons in an atom is the ______________ of an element is the average mass of the element's __________

a. The average atomic mass is abundance of each isotope.

according to the

E. Ions--Gaining or Losing Electrons

1. A(n) gained or lost

is an atom that is no longer neutral because it has .

2. A positive ion is an atom that has

electrons.

3. A negative ion is an atom that has

30

electrons.

Understanding the Atom

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