High School

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

Answer :

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

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