Chapter 1

Question 1

Matter

Answer 1

Any substance in the universe that has mass or occupies space

Question 2

Atoms

Answer 2

Building blocks of all matter

Question 3

Element

Answer 3

A term used to describe atoms that contain the same number of protons

Question 4

Isotopes

Answer 4

The number of neutrons in atoms of an element can be variable

Question 5

Atomic Mass

Answer 5

Sum of the masses of an atom protons and neutrons

Question 6

Constant

Answer 6

The number of protons in atoms of an element

Question 7

Radioactive Isotopes

Answer 7

Unstable isotopes that occur when the ratio of neutrons to protons in atoms of an element are not ideal

Question 8

Radioactive Decay

Answer 8

Atoms will eventually reconfigure their nucleus in order to achieve a more stable ratio

Question 9

Half-Life

Answer 9

The time it takes for 1/2 (half) of the amount of radioactive isotopes in a sample to decay

Question 10

Valence Electrons

Answer 10

The electrons in the outer shell

Question 11

Electron Shells

Answer 11

Energy levels from when electrons within an atom possesses discrete amounts of energy based upon their distance from the nucleus

Question 12

Orbits

Answer 12

Contains negatively charged electrons circling the nucleus

Question 13

Atomic Number

Answer 13

The number of protons found in the nucleus the atom.