Lesson 4.5

Question 1

Atoms of the same element that have the same number of protons and
electrons but different numbers of neutrons are called

Answer 1

Isotopes

Question 2

Most isotopes are

Answer 2

naturally occurring

Question 3

can be produced from heavier elements.
These isotopes are highly unstable

Answer 3

Artificial isotopes, also known as radioisotopes,

Question 4

are elements that have the same number of neutrons

Answer 4

Isotones

Question 5

are elements that have the same mass number but different atomic numbers

Answer 5

Isobars

Question 6

Isotopes are sets of elements which have the same number of
protons. Isotones are sets of elements which have the same
number of neutrons. It follows that isobars are sets of elements
which have the same mass numbers.