Determine the number of neutrons, protons, and electrons for a bromide ion that has a mass number of 79 , and a charge of −1. number of neutrons: number of protons: number of electrons: Determine the element symbol, number of protons, and number of electrons for an ion that has a mass number of 56, 30 neutrons, and a charge of +3.

First of all, it should be understood that when an element gains electron(s), it becomes negatively charged and when it loses electron(s), it becomes positively charged. These charges do not affect the atomic number which is the number of protons. Also, the mass number is the sum of protons and neutrons in the nucleus of an atom. Ordinarily (without a charge), the number of protons present in an element is equal to the number of electrons present in the same element.

From the above, the question can be answered easily

1) Bromine has an atomic number (number of protons) of 35. The question provided the mass number to be 79. Hence, to calculate the number of neutrons, atomic number will be subtracted from the mass number (since the mass number is the addition of protons and neutrons).

number of neutrons = 79 - 35 = 44

Ordinarily, number of protons equals number of electrons which means bromine ordinarily has 35 electrons but bromine ion (Br⁻) is a negatively charged ion which means it has accepted/gained one electron to make its number of electrons, 36.

2) If the mass number of an element is 56 and it's number of neutrons is 30, it's atomic number will be (from the explanation given earlier):

Mass number - number of neutrons

Atomic number (number of protons) = 56 - 30 = 26

The element with the atomic number of 26 is Iron (Fe)

Since, number of protons ordinarily equals number of electrons, then the number of electrons in Fe is 26 but Iron (III) ion (Fe³⁺) has lost 3 electrons because of the charge on it. This means the element has 23 electrons.

pstnonsonjoku pstnonsonjoku · Answer 2 · 2022-01-25T13:09:37+01:00

For the element that has a mass number of 56 and 30 neutrons with a charge of +3, there are 26 protons and 23 electrons. The symbol of the element is Fe(iron).

The atomic number refers to the number of protons in the nucleus. The mass number is the sum of the number of protons and the number of neutrons in an atom.

For the bromide ion with a mass number of 79 and a charge of -1, there are 36 electrons, 35 protons and 44 neutrons present. For the element that has a mass number of 56 and 30 neutrons with a charge of +3, there are 26 protons and 23 electrons. The symbol of the element is Fe(iron).

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