Question

The atomic and mass numbers for four different atoms are given below. Which two are isotopes?

Atom Atomic# Mass#
W 50 117
X 50 119
Y 51 119
Z 52 117

Answer 1

w and y because w and y is the closest out of all atoms

Answer 2

Answer: Atom W and atom X are isotopes.

Step-by-step explanation:

Isotopes are defined as the substances which have same atomic number but different mass number.

We are given:

For atom W:

Atomic number = 50

Mass number = 117

For atom X:

Atomic number = 50

Mass number = 119

For atom Y:

Atomic number = 51

Mass number = 119

For atom Z:

Atomic number = 52

Mass number = 117

As, atom W and atom X have same atomic number. Thus, they are isotopes.