Radioactivity / Isotopes

Question 1

For an atom of one element to change into a different element the number of ____________ must change.

Answer 1

protons

Question 2

ability of an atom to emit charged particles and energy from its nucleus

Answer 2

radioactivity

Question 3

the charged particles and energy emitted from a nucleus

Answer 3

radiation

Question 4

general type of atoms that are radioactive

Answer 4

unstable nucleus

Question 5

holds protons together in the nucleus

Answer 5

strong nuclear force

Question 6

tries to repel protons from each other in the nucleus

Answer 6

Coulombic force

Question 7

all elements with this number of protons or more are radioactive

Answer 7

84

Question 8

an element can also be radioactive if its proton to neutron __________ is not equal to 1

Answer 8

ratio

Question 9

radioactivity was discovered by

Answer 9

Becquerel

Question 10

this person discovered polonium and radium

Answer 10

Curie

Question 11

atoms of an element that do not have the same number of neutrons as protons

Answer 11

isotopes

Question 12

number of protons in an alpha particle

Answer 12

2

Question 13

number of neutrons in an alpha particle

Answer 13

2

Question 14

number of electrons in an alpha particle

Answer 14

0

Question 15

approximate amount of energy released by the emission of an alpha particle

Answer 15

13 J

Question 16

the mass number of an atom equals the number of

Answer 16

protons and neutrons

Question 17

the atomic number of an atom equals the number of

Answer 17

protons

Question 18

occurs by the release of alpha particles

Answer 18

alpha radiation

Question 19

type of radiation with the lowest amount of released energy

Answer 19

alpha

Question 20

charge of an alpha particle

Answer 20

2+

Question 21

symbol for an alpha particle

Answer 21

ɑ

Question 22

number of protons in silicon-28

Answer 22

14

Question 23

number of neutrons in silicon-28

Answer 23

14

Question 24

number of protons in phosphorus-31

Answer 24

15

Question 25

number of neutrons in phosphorus-31

Answer 25

16

Question 26

number of protons in carbon-14

Answer 26

6

Question 27

number of neutrons in carbon-14

Answer 27

8

Question 28

another name for Coulombic force

Answer 28

electrostatic force