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?

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.