Quiz 1: Isotopes, Ions, and Average Atomic Mass 9th Grade Chem

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15 Terms

1

Mass number

Total number of protons and neutrons in an atom.

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2

Atomic number

The number of protons in an atom, found as the larger number on the periodic table.

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3

Atomic mass

The average of the relative amounts of each isotope of an element.

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4

Electrons

Negatively charged particles found outside of the nucleus of an atom.

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5

Protons

Positively charged particles found in the nucleus of an atom.

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6

Neutrons

Uncharged particles found in the nucleus of an atom.

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7

Neutral atoms

Atoms that have the same number of electrons and protons.

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8

Isotopes

Atoms of the same element with the same number of protons but a differing number of neutrons.

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9

Ions

Atoms that have an unequal number of protons and electrons, resulting in a charge.

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10

Positive ion

Formed when an atom has more protons than electrons.

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11

Negative ion

Formed when an atom has more electrons than protons.

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12

Fractional abundance

The percentage of a particular isotope in a total sample of atoms, expressed as a decimal.

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13

Calculating average atomic mass (AAM) formula

(atomic mass of isotope #1) x (fractional abundance of isotope #1) + (atomic mass of isotope #2) x (fractional abundance of isotope #2).

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14

Significant figures rule for multiplication/division

Round to the least number of significant figures in the calculation.

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15

Significant figures rule for addition/subtraction

Align decimal points; round to the smallest number of decimal places.

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