p104-124

Question 1

electron

Answer 1

A negatively charged particle that is found outside the nucleus of an atom

Question 2

energy level

Answer 2

The specific amount of energy an electron has

Question 3

nucleus

Answer 3

The central core of the atom

Question 4

neutron

Answer 4

A small particle in the nucleus of the atom, with no electrical charge.

Question 5

atomic number

Answer 5

The number of protons in the nucleus of an atom

Question 6

isotope

Answer 6

An atom with the same numbers of protons and a different number of neutrons from other atoms of the same element

Question 7

mass number

Answer 7

The sum of protons and neutrons in the nucleus of an atom

Question 8

atomic mass

Answer 8

The average mass of all the isotopes of an element

Question 9

periodic table

Answer 9

A chart of the elements showing the repeating pattern of their properties

Question 10

group

Answer 10

Elements in the same vertical column of the periodic table; also called a family

Question 11

period

Answer 11

A horizontal row of elements in the periodic table

Question 12

chemical symbol

Answer 12

A one or two-letter representation of an element

Question 13

nuclear fusion

Answer 13

The process in which two atomic nuclei combine to form a larger nucleus, forming a heavier element and releasing huge amounts of energy

Question 14

plasma

Answer 14

A gas-like state of matter consisting of a mixture of free electrons and atoms that are stripped of their electrons

Question 15

ductile

Answer 15

A term used to describe a material that can be pulled out into a long wire

Question 16

malleable

Answer 16

A term used to describe material that can be pounded into shapes

Question 17

metal

Answer 17

A class of elements characterized by physical properties that include shininess, malleability, ductility, and conductivity.

Question 18

conductivity

Answer 18

The ability of an object to transfer heat or electricity to another object

Question 19

corrosion

Answer 19

The gradual wearing away of a metal element due to a chemical reaction

Question 20

alkali metal

Answer 20

An element in Group 1 of the periodic table

Question 21

alkaline earth metal

Answer 21

An element in Group 2 of the periodic table

Question 22

alloy

Answer 22

A mixture of two or more elements, one of which is a metal

Question 23

particle accelerator

Answer 23

A machine that moves atomic nuclei at higher and higher speeds until they crash into on another, sometimes forming heavier elements