Chapter 3 Test

Question 1

electrons

Answer 1

negatively charged particles

Question 2

nucleus

Answer 2

atoms positively charged center

Question 3

proton

Answer 3

positively charged particles

Question 4

energy level

Answer 4

specific amount of energy an electron has

Question 5

nuetron

Answer 5

a particle with no electrical charge

Question 6

atomic number

Answer 6

number of protons in the nucleus of an atom

Question 7

isotope

Answer 7

atoms with the same number of protons and different numbers of neutrons

Question 8

mass number

Answer 8

sum of protons and nuetrons

Question 9

atomic mass

Answer 9

average mass of all the isotopes of that element

Question 10

periodic table

Answer 10

arrangement of elements showing the regular pattern of their properties

Question 11

chemical symbol

Answer 11

containing either 1 or 2 letters abbreviating their names to represent them

Question 12

period

Answer 12

rows in the periodic table

Question 13

group

Answer 13

also known as families, elements in a column

Question 14

metals

Answer 14

good conductors of electric current and heat

Question 15

luster

Answer 15

shiny and reflective

Question 16

malleable

Answer 16

hammered or rolled into flat sheets or other shapes

Question 17

ductile

Answer 17

material that can be pulled out or drawn into long wires

Question 18

thermal conductivity

Answer 18

the ability of an object to transfer heat

Question 19

electrical conductivity

Answer 19

the ability of an object to transfer electrical

Question 20

reactivity

Answer 20

ease and speed at which an element combines, or reacts, with other substances

Question 21

corrosion

Answer 21

deterioration due to a chemical reaction in the environment

Question 22

alkali metals

Answer 22

most reactive metals

Question 23

alkaline earth metals

Answer 23

harder, denser, and have a higher melting point than the alkali metals but not as reactive

Question 24

transition metals

Answer 24

hard shiny solids and have high melting points and high densities good conductors of heat and electricity

Question 25

nonmetals

Answer 25

lacks most properties of a metal

Question 26

diatomic metal

Answer 26

made up of two atoms

Question 27

halogens

Answer 27

very reactive

Question 28

noble gases

Answer 28

non-reactive elements

Question 29

metalloids

Answer 29

elements that have some properties of metals and properties of nonmetals

Question 30

semiconductors

Answer 30

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

Question 31

atom

Answer 31

smallest particle that can be considered an element