EASY
9th CBSE
IMPORTANT
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The following diagram depicts the Rutherford’s experiment.

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Why was zinc sulphide screen is used in the experiment?

33.33% studentsanswered this correctly

Important Questions on Structure of the Atom

EASY
9th CBSE
IMPORTANT

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.

EASY
9th CBSE
IMPORTANT

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.

EASY
9th CBSE
IMPORTANT
The number of electrons in an element X is 18 and the number of neutrons is 22. Which of the following is the correct representation of the element? 
EASY
9th CBSE
IMPORTANT

Different isotopes are matched with their uses as

(i) Co-60-To treat cancer

(ii) U-238-To produce electricity

(iii) I-131-To treat goitre

(iv) Na-24-In agricultural research

Which of the above matches are correct?

EASY
9th CBSE
IMPORTANT
In a sample of ethyl ethanoate(CH3COOC2H5) the two oxygen atoms have the same number of electrons but different number of neutrons. Which of the following is the correct reason for it?