The protons, neutrons, and electrons in the atom of the element represented by the symbol [tex]^{231}_{89}Y[/tex] are:

A. 89 protons, 231 neutrons, and 89 electrons
B. 142 protons, 89 neutrons, and 142 electrons
C. 89 protons, 142 neutrons, and 89 electrons
D. 89 protons, 320 neutrons, and 320 electrons

Question

High School

Answer :

aabdulsamir aabdulsamir · Answer 1 · 2023-09-12T00:30:18-04:00

Answer:

Protons = 89

Neutrons = 142

Electrons = 89

Option C

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