Question

An element has atomic number 13 and an atomic mass of 27.
(a) How many electrons are there in each atom of the element?
(b) How are these electrons distributed in the various energy levels?

Answer 1

Hint : The number of protons in the nucleus of an atom of a chemical element is known as the atomic number or proton number (symbol Z). A chemical element's atomic number is the only way to identify it. It is the same as the nucleus' charge number.
The cumulative number of protons and neutrons in an atomic nucleus is known as the mass number, also known as the atomic mass number or nucleon number. It's almost the same as the atom's atomic mass expressed in atomic mass units.

Complete Step By Step Answer:
The number of protons in the nucleus of an atom of a chemical element is known as the atomic number or proton number (symbol Z). A chemical element's atomic number is the only way to identify it. It is the same as the nucleus' charge number.
The cumulative number of protons and neutrons in an atomic nucleus is known as the mass number, also known as the atomic mass number or nucleon number. It's almost the same as the atom's atomic mass expressed in atomic mass units.
The element described here is Aluminium.
Each atom of the element would have 13 electrons. That the number of protons in a neutral atom is equal to the number of electrons.
Aluminium (2, 8, 3) has the electronic structure
K= 2
L=8
M=3
In chemistry and atomic physics, an electron shell is an orbit that electrons adopt around the nucleus of an atom. The "1 shell" is the one nearest to the nucleus, followed by the "2 shell," then the "3 shell," and so on as you get farther away from the nucleus.

Note :
In chemistry and atomic physics, an electron shell is an orbit that electrons adopt around the nucleus of an atom. The "1 shell" is the one nearest to the nucleus, followed by the "2 shell," then the "3 shell," and so on as you get farther away from the nucleus.