An element has an atomic number of 11 and its mass number is 23. What is the arrangement of electrons in the shells? State nuclear composition of an atom of the element.

The mass number of an element is 23 and it contains 11 electrons. What is the number of protons and neutrons in it? What is the atomic number of the element?

Describe Bohr’s model of the atom. How did Neils Bohr explain the stability of atom?

What is meant by (i) atomic number, and (ii) mass number, of an element? Explain with the help of an example.

What is the relation between the atomic number and mass number of an element?