Q5 of 43 Page 26

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

According to Rutherford’s model of an atom, there is a positively charged center called nucleus. Almost all the mass of an atom resides in the nucleus. The electrons revolve around the nucleus in well-defined orbits which can be compared to the solar system.

More from this chapter

All 43 →
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?

 4

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

 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

 7

In the Thomson’s model of the atom, which of the following statements are correct?

(i) the mass of the atom is assumed to be uniformly distributed over the atom


(ii) the positive charge is assumed to be uniformly distributed over the atom


(iii) the electrons are uniformly distributed in the positively charged sphere


(iv) the electrons attract each other to stabilize the atom