Q4 of 43 Page 26

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

Dalton’s atomic theory was based on laws of chemical combination. His theory provided an explanation for the law of conservation of mass and the law of definite proportions.

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2

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

 3

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?

 5

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

 6

Which of the following are true for an element?

(i) Atomic number = number of protons + number of electrons


(ii) Mass number = number of protons + number of neutrons


(iii) Atomic mass = number of protons = number of neutrons


(iv) Atomic number = number of protons = number of electrons