Properties

Question 1

Atomic Number (Z)

Answer 1

The number of protons found in the nucleus. This is unique to each element and identifies it’s identity.

Question 2

Mass Number (A)

Answer 2

The total number of protons (Z) and neutrons (N) in a nucleus.

Question 3

Isotopes

Answer 3

Different isotopes of the same element have the same number of protons (Z) but different numbers of neutrons, resulting in different mass numbers (A).

Question 4

H-3
Atomic Number
Mass Number

Answer 4

Z = 1
A = 3
(1 proton, 2 neutrons)

Question 5

C-14
Atomic Number
Mass Number

Answer 5

Z = 6
A = 14
(6 protons, 8 neutrons)

Question 6

F-18
Atomic Number
Mass Number

Answer 6

Z = 9
A = 18
(9 protons, 9 neutrons)

Question 7

P-32
Atomic Number
Mass Number

Answer 7

Z = 15
A = 32
(15 protons, 17 neutrons)

Question 8

S-35
Atomic Number
Mass Number

Answer 8

Z = 16
A = 35
(35 protons, 19 neutrons)

Question 9

Co-60
Atomic Number
Mass Number

Answer 9

Z = 27
A = 60
(27 protons, 33 neutrons)

Question 10

Sr-90
Atomic Number
Mass Number

Answer 10

Z = 38
A = 90
(38 protons, 52 neutrons)

Question 11

Tc-99m
Atomic Number
Mass Number

Answer 11

Z = 43
A = 99
(43 protons, 56 neutrons)

Question 12

I-125
Atomic Number
Mass Number

Answer 12

Z = 53
A = 125
(53 protons, 72 neutrons)

Question 13

I-131
Atomic Number
Mass Number

Answer 13

Z = 53
A = 131
(53 protons, 78 neutrons)

Question 14

Cs-137
Atomic Number
Mass Number

Answer 14

Z = 55
A = 137
(55 protons, 82 neutrons)

Question 15

Ra-226
Atomic Number
Mass Number

Answer 15

Z = 88
A = 226
(88 protons, 138 neutrons)

Question 16

Am-241
Atomic Number
Mass Number

Answer 16

Z = 95
A = 241
(95 protons, 146 neutrons)

Question 17

Y-90
Atomic Number
Mass Number

Answer 17

Z = 39
A = 90
(39 protons, 51 neutrons)

Question 18

Lu-177
Atomic Number
Mass Number

Answer 18

Z = 71
A = 177
(71 protons, 106 neutrons)