Question

A se ion has a mass number of 78 and a charge of 2 . Determine the number of neutrons, protons, and electrons in this ion.

Answer 1

Answer:answer- 44,78,76

Explanation:since atomic no. Is 34 .

So neutron = 78-34= 44.

Electron= 76.

Proton =78...

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Answer 2

The number of neutrons, protons, and electrons in this ion are 44, 34 and 36 respectively.

Explanation:

An ion is formed when electron gets added or removed from an element. When electron gets removed from the element, it results in the formation of positive ion known as cation and when electron gets added to an element, it results in the formation of negative ion known as anion.

Atomic number is defined as the number of electrons or number of protons present in an electrically neutral element. Atomic number of Selenium is 34

Atomic number = Number of protons = 34

Number of electrons in $Se^{2-}$ = 34+2 = 36

Mass number is defined as the sum of number of protons and number of neutrons.

Mass number = Number of protons + Number of neutrons

Number of protons + Number of neutrons =78

34+ Number of neutrons =78

Number of neutrons = 44

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