Q1 of 43 Page 26

Which of the following correctly represents the electronic distribution in the Mg atom?

The atomic number of Magnesium is 12. Hence, the distribution of electrons in the different shells will be as follows:

Kth shell - 2, Lth shell -8 and Mth shell-2

Rutherford’s ‘alpha (α) particles scattering experiment’ resulted into discovery of

The number of electrons in an element X is 15 and the number of neutrons is 16. Which of the following is the correct representation of the element?

Dalton’s atomic theory successfully explained

(i) Law of conservation of mass

(ii) Law of constant composition

(iii) Law of radioactivity

(iv) Law of multiple proportions

Which of the following statements about Rutherford’s model of atom are correct?

(i) considered the nucleus as positively charged

(ii) established that the α–particles are four times as heavy as a hydrogen atom

(iii) can be compared to solar system

(iv) was in agreement with Thomson’s model