Question

identify the element X it's geometrical representation is 20X40​

Answer 1

Answer:

Atomic number =15= No. of electrons= No. of protons

Mass Number = 31

Number of neutrons + number of protons= Atomic mass number.

∴ Number of neutrons =31−number of protons

=31−15

=16

Answer 2

The element X is Calcium.

• The representation of the element X is as follows-
• $^{20}X_{40}$.
• Hence the atomic number of X is 20 and the mass number of X is 40.
• Hence element X is calcium.
• The symbol of Calcium is Ca and it has an atomic number of 20.
• Ca is an alkaline earth metal residing in group 2 of the modern periodic table.