Lesson 2

Question 1

_____ are atoms of the same element with different number of neutrons or mass
numbers

Answer 1

Isotopes

Question 2

Since the number of protons (the identity of an element) are fixed for all naturally
occurring atoms of the same element, isotopes can only differ in the number of ______.

Answer 2

neutrons

Question 3

_______ is calculated as the sum of the products of the atomic mass (isotopic mass) and the percentage abundance of each isotope of the element naturally occur in nature.

Answer 3

Atomic mass

Question 4

________ can be used to trace leaks in gas or oil pipes in ventilating system. Such radioisotopes are called tracers.

Answer 4

Sodium – 24

Question 5

radio therapy to prevent cancer

Answer 5

Cobalt - 60

Question 6

locate brain tumors, monitor cardiac, liver and thyroid activity

Answer 6

Iodine - 131

Question 7

study metabolism changes for patients with diabtes, gout, and anemia

Answer 7

Carbon 14

Question 8

used for relative dating of fossils

Answer 8

carbon - 14

Question 9

study blood circulation

Answer 9

sodium - 24

Question 10

for uniform thickness in rolling steel and paper, determines location of oil wells

Answer 10

americium - 241

Question 11

tests integrity of boilers and aircraft parts

Answer 11

iridium - 192

Question 12

nuclear power plant and naval propulsion system fuel production of fluorescent glassware and colored wall tiles

Answer 12

uranium - 235

Question 13

determine moisture content of soil – important for road construction and building industries

Answer 13

californium - 252

Question 14

oil well studies and to locate leak in pipe lines

Answer 14

sodium - 24