Ch32

Question 0

Neutron number

Answer 0

N

Number of neutrons

Question 1

Atomic number

Answer 1

Z

Protons in a nucleus

Question 2

Mass number

Answer 2

A

Total number of protons and neutron (n and z)

Question 3

Isotopes

Answer 3

Same atomic number dif number of neutrons

Question 4

Radioactivity

Answer 4

The emissions observed when an unstable nucleus changes its composition or when an excited nucleus decays to a lower energy state

Question 5

Alpha decay

Answer 5

Nucleus decreases its mass number by 4 and atomic number by 2

Question 6

Beta decay

Answer 6

Emission of an electron Increases atomic number by one but leaves mass number unchanged

Question 7

Gamma decay

Answer 7

Occurs when an excited nucleus drops to a lower energy state and emits a photon. Neither mass number or atomic number change

Question 8

Activity of a radioactive sample

Answer 8

Number of decays per second

Question 9

Half life

Answer 9

Time required for half of its nucleus to decay

Question 10

Binding energy of s nucleus

Answer 10

Energy that must be supplied to separate it into its component nucleons

Question 11

Nuclear fission

Answer 11

Process in which a large nucleus captures a neutron and then divides it into two smaller daugter nuclei

Question 12

Nucleons

Answer 12

Neutrons and protons

Question 13

Strong nuclear force

Answer 13

Force that holds protons in the nucleus

Holds nuckeus together

Question 14

Mass defect

Answer 14

Delta m

Question 15

Moderator

Answer 15

To slow neutrons to thermal range

Question 16

Control rods

Answer 16

Contain boron or cadmium which absorb neutrons without fissioning

Question 17

Critical fission

Answer 17

When each fission leads to one additional fission.. No more or less

Question 18

Sub critical fission

Answer 18

Less than one neutron produced

Question 19

Super critical fission

Answer 19

More than one neutron produced