Question

Write the symbol for a calcium ion. How many electrons does it have? If the mass number is 41, then how many neutrons does it have?

Answer 1

Explanation:

calcium ion is denoted as - Ca ²⁺

The number of electrons in a neutral atom of calcium = 20 , but since ,

it is charged atom ,

i.e. +2 , the number of electrons in calcium ion = 18 .

From , the question ,

The mass number = 41 ,

and

since ,

the mass number = number of protons + number of neutrons .

number of neutrons = mass number - number of protons

since ,

The number of protons for calcium ion = 20

number of neutrons = 41 - 20 = 21

Hence ,

number of neutrons = 21.