Chapter 2

Question 1

occupies space and has mass

Answer 1

matter

Question 2

simplest substance; can’t be broken down by ordinary means

Answer 2

element

Question 3

what are the 4 elements that 96% of the body is composed of

Answer 3

carbon
hydrogen
oxygen
nitrogen

Question 4

necessary elements in the body that are in small amounts

Answer 4

trace elements

Question 5

2 or more elements in a fixed ratio

Answer 5

compound

Question 6

smallest unit of matter w/ properties of elements

Answer 6

atom

Question 7

the three subatomic particles

Answer 7

protons
electrons
neutrons

Question 8

which subatomic particles are found in the nucleus

Answer 8

protons and neutrons

Question 9

which subatomic particle is constantly orbiting the nucleus in the orbit shell

Answer 9

electrons

Question 10

of protons in an atom; determines identity

Answer 10

atomic number

Question 11

protons + neutrons; approximate mass of an atom

Answer 11

mass number

Question 12

atoms that differ in the number of neutrons only

Answer 12

isotopes

Question 13

unstable nucleus emits energy in the form of radiation

Answer 13

radioactive isotopes

Question 14

what are some used for radioisotopes

Answer 14

1 disease diagnosis
2 cancer treatment
3 biomedical research
4 dating of material

Question 15

determined properties of an atom

Answer 15

electrons arrangement

Question 16

atom that has a stable/ full outer shell

Answer 16

inert

Question 17

forces of attraction that allow atoms to achieve stable outer shells

Answer 17

ionic and covalents bonds

Question 18

force of attraction between 2 ions with opposite charges

Answer 18

ionic bond

Question 19

atom that has lost or gained electrons

Answer 19

ion

Question 20

are ions charged ?

Answer 20

yes

Question 21

are atoms charged?

Answer 21

no they have a balance of protons and electrons

Question 22

electrons are shared between 2 atoms

Answer 22

covalent bonds