Front

Isotopes of an element have a different number of...

Back

Neutrons

Front

Potassium-39 has how many neutrons?

Back

20

Front

Rubidium has two common isotopes, ⁸⁵Rb and ⁸⁷Rb. If the abundance of ⁸⁵Rb is 72.2% and the abundance of ⁸⁷Rb is 27.8%, what is the average atomic mass of rubidium?

Back

85.6 amu

Front

Which isotope is used to sterilize surgical tools in the medical field? Options: Cobalt-60, Fluorine-9, Hydrogen-14, Iodine-131

Back

Cobalt-60

Front

Bromine-80 has how many neutrons?

Back

45

Front

Isotope with 12 protons and 13 neutrons?

Back

Magnesium-25

Front

12 protons and 13 neutrons

Back

Mg-25

Front

Nickel-59 has how many neutrons?

Back

31

Front

There are two primary isotopes found in any sample of copper: copper-63 and copper-65. The isotope ⁶⁵Cu composes 69.2% of the sample and ⁶³Cu comprises the other 30.8%. Based on this data, what is the atomic mass of copper?

Back

64.4 amu

Front

Which of the following isotopes is used in agriculture? Cobalt-60, Lead-210, Phosphorus-32, Carbon-14

Back

Phosphorus-32