Chapter 4 Section 2 Flashcards Preview

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Flashcards in Chapter 4 Section 2 Deck (11):
1

proton

a subatomic practical that has a positive charge and that is found in the nucleus of an atom.

2

atomic mass unit

a unit of mass that describes the mass of an atom or molecule.

3

neutron

a subatomic particle that has no charge and that is found in the nucleus of an atom.

4

atomic number

the number of protons in the nucleus of an atom; the atomic number is the same for all atoms of an element.

5

isotope

an atom that has the same number of protons (or same atomic number) as other atoms of the same element do but that has a different number of neutrons.

6

mass number

the sum of the numbers of protons and neutrons in the nucleus of an atom.

7

atomic mass

the mass of an atom expressed in atomic muss units.

8

periodic

describes something that occurs or repeats at regular intervals.

9

periodic law

the law that states that the repeating chemical and physical properties of elements change periodically with the atomic numbers of the elements.

10

period

in chemistry, a horizontal row of elements in the periodic table.

11

group

a vertical column of elements in the periodic table.