Is it possible for the atom of an element to have one electron, one proton and no neutron. If so, name the element.

Which of the following statement is always correct?

Atomic models have been improved over the years. Arrange the following atomic models in the order of their chronological order

(i) Rutherford’s atomic model

(ii) Thomson’s atomic model

(iii) Bohr’s atomic model

Write any two observations which support the fact that atoms are divisible.

Will Cl³⁵and Cl³⁷have different valencies? Justify your answer.