How many protons are there in the nucleus of^40_20 Ca? ____________ How many electrons are there...

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Answer 1

Answer #1

$_{Z}^{A}\textrm{E}$

Where Z is atomic number i.e, the number of protons

A is mass number = Number of protons +number of neutrons

1) Z( number of protons) = 20, A = 40, number of neutrons = 20

2) Z = 90, In a neutral atom number of protons = number of electrons

therefor, number of electrons is 90

3) A = 14 , therefore number of nucleons = 14

4) Z = 3, A = 7

number of neutrons = A-Z = 4

5) A= 232, Z = 90

number of neutrons = 142

6) Invalid question

Answer 2

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