Q17 of 43 Page 26

Which of the following statement is always correct?

An atom as a whole is neutral. It is neither positive nor negative. The number of electrons are always equal to the number of protons. The mass of the atom is the sum of the masses of protons and neutrons.

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The electron distribution in an aluminium atom is

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Which of the following in Fig. 4.2 do not represent Bohr’s model of an atom correctly?

 18

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

 19

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