Question

The proton,neutron and electrons in the atom of the element represented by the symbol 231Y89 are:

A. 89,231 and 89
B. 142, 89 and 142
C. 89, 142 and 89
D. 89, 320 and 320​

Answer 1

Protons = 89

Neutrons = 142

Electrons = 89

Option C

Step-by-step explanation:

Hello,

Were required to find the proton, neutron and electron of an element Y

The atomic mass of element Y is composed of the protons and neutrons while the atomic number is the exact amount of protons present in the element.

Element = ₈₉²³¹Y

Atomic number = 89

Number of protons = 89

Number of electrons = 89

Atomic mass = 231

Atomic mass = protons + neutrons

231 = 89 + neutrons

Neutrons = 231 - 89

Neutrons = 142

Therefore the number of protons is 89, number of neutrons is 142 and number of electrons is 89.

Note: for an electrically neutral atom, the number of protons must be equal to the number of electrons