Question

The number of protons, neutrons and electrons in \[\ce{^175_71Lu}\], respectively, are ______.

Options

• 71, 104 and 71

• 104, 71 and 71

• 71, 71 and 104

• 175, 104 and 71

Answer 1

The number of protons, neutrons and electrons in \[\ce{^175_71Lu}\], respectively, are 71, 104 and 71.

Explanation:

Atomic number (Z) = 71

Number of protons = 71

Number of electrons = 71 (since the atom is neutral)

Mass number (A) = 175

Number of neutrons = A − Z

= 175 − 71

= 104