Question

Find out the number of elections, protons and neutron
following
40Ca
20​

Answer 1

Explanation:

The number of protons is half the number of neutrons.

Number of Protons = atomic number = 20.

Therefore, number of protons = 20.

Number of electrons = number of protons = 20.

Number of neutrons = Mass number - number of protons = 40-20 = 20.

The only option states wrong about Ca is C.

Answer 2

Answer:-

• The element is Calcium here.

The symbol given by

$\\ \sf\longmapsto 20^{N^{40}}$

Here

• Atomic mass=40
• Atomic number=20

We know

$\\ \sf\longmapsto No\:of\:protons=Atomic\:Number$

$\therefore\underline{\boxed{\bf No\:of\:Protons=20}}$

Again

$\\ \sf\longmapsto No\:of\:protons=No\:of\:electrons$

$\therefore\underline{\boxed{\bf No\:of\:electrons=20}}$

And

$\\ \sf\longmapsto No\:of\:Neutrons=Atomic\:Mass-No\:of\:Protons$

$\\ \sf\longmapsto 40-20=20$

$\therefore\underline{\boxed{\bf No\:of\:Neutrons=20}}$