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Flashcards in Ch 4 Deck (17)
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1

Theory that states in part that most of the volume of the atom is empty space

Nuclear theory of the atom

2

One 12th of the mass of a Carbon atom containing six protons and six neutrons

Atomic mass unit (amu)

3

Number of protons in the nucleus of an atom

Atomic number (Z)

4

One or two letter abbreviations for an element

Chemical symbol

5

When the elements are arranged in order of increasing atomic number, certain set of properties recur periodically

Periodic law

6

Elements whose properties tend to be more predictable based on their position in the periodic table

Main group elements

7

Elements whose properties tend to be less predictable based simply on their position in the periodic table

Transition metals

8

Column of elements in the periodic table

Family or group (of elements)

9

Group 8A elements

Noble gases

10

Group 1A elements

Alkali metals

11

Group 2A elements

Alkaline earth metals

12

Relative amount of an isotope in a naturally occurring sample of a given element

Percent natural abundance

13

Some of the number of protons and neutrons in an atom

Mass number (A)

14

Subatomic particles emitted from unstable nuclei

Nuclear radiation

15

Average mass of the atoms that compose an element

Atomic mass

16

Characteristic of unstable nuclei that emit radiation

Radioactive

17

Organized chart of the elements

Periodic table