Ch. 3 Elements & the Periodic Table

Question 1

a fast moving electron that is given off as nuclear radiation

Answer 1

Beta Particle

Question 2

a horizontal row of elements in the periodic table

Answer 2

Period

Question 3

a molecule made up of two atoms

Answer 3

Diatomic Molecule

Question 4

a one or letter representation of an element

Answer 4

Chemical Symbol

Question 5

a particle given off during radioactive decay that consists of two protons and two neutrons

Answer 5

Alpha Particle

Question 6

a physical property of metal that is shiny and reflective

Answer 6

Luster

Question 7

a process in which radioactive breakdown releasing fast moving particles and energy

Answer 7

Radioactive Decay

Question 8

a reaction that involves the particles in the nucleus of an atom that can change one element to another element

Answer 8

Nuclear Reaction

Question 9

a region of an atom in which electrons of the same energy are likely to be found

Answer 9

Energy Level

Question 10

a small particle in the nucleus of an atom with no electrical charge

Answer 10

Neutron

Question 11

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

Answer 11

Ductile

Question 12

an atom with the same number of protons and a different number of neutrons

Answer 12

Isotope

Question 13

an element that has some characteristics of both metals and nonmetals

Answer 13

Metalloid

Question 14

an element that lacks most of the properties of a metal

Answer 14

Nonmetal

Question 15

elements in the same vertical column in the periodic table, also called family

Answer 15

Group

Question 16

elements that are good conductors of electric current and heat

Answer 16

Metal

Question 17

high energy electromagnetic wave with the shortest wavelength & highest frequency

Answer 17

Gamma Ray

Question 18

materials that can be hammered or rolled into flat sheets

Answer 18

Malleable

Question 19

negatively charged particles in an atom

Answer 19

Electron

Question 20

object’s ability to conduct electricity

Answer 20

Electrical Conductivity

Question 21

positively charged particles in the nucleus of an atom

Answer 21

Proton

Question 22

radioactive isotopes that can be followed through the steps of a chemical reaction or an industrial process

Answer 22

Tracer

Question 23

scientific method to determine the age of an object using the half life of one or more radioactive isotopes

Answer 23

Radioactive Dating

Question 24

small region in an atoms center, containing protons and neutrons

Answer 24

Nucleus

Question 25

substances that can conduct electric current under some conditions but not under other conditions

Answer 25

Semiconductor

Question 26

the ability of an object to transfer heat

Answer 26

Thermal Conductivity

Question 27

the arrangement of elements showing the repeating pattern of their properties

Answer 27

Periodic Table

Question 28

the average mass of all the isotopes of an atom

Answer 28

Atomic Mass

Question 29

the elements in group 18 of the periodic table, non-reactive because the valence energy level is full

Answer 29

Noble Gas

Question 30

the elements in group seventeen of the periodic table, starting with fluorine

Answer 30

Halogen

Question 31

the elements in groups three through twelve of the periodic table

Answer 31

Transition Metal

Question 32

the elements in group two of the periodic table, very reactive, hard and dense

Answer 32

Alkaline Earth Metal

Question 33

the gradual wearing away from chemical reaction

Answer 33

Corrosion

Question 34

the most reactive metals in the periodic table, all in group one

Answer 34

Alkali Metal

Question 35

the number of protons in the nucleus of an atom

Answer 35

Atomic Number

Question 36

the smallest particle that can still be considered an element

Answer 36

Atom

Question 37

the spontaneous emission of radiation by an unstable atomic nucleus

Answer 37

Radioactivity

Question 38

the sum of the protons and neutrons in an atom

Answer 38

Mass Number

Question 39

the time it takes for half the atom of a radioactive element to decay

Answer 39

Half-life

Question 40

when an element combines or reacts with other elements and compounds

Answer 40

Reactivity