Ch – 4 Structure Of The Atom ( Part 3 )

Q.1: ____________ are defined as the atoms of the same element, having the same atomic number, but different mass numbers.

a) Isobars

b) Isotopes

c) Both

Q.2: Each ___________ of an element is a pure substance.

a) Isobar

b) Isotope

c) Both

Q.3: An isotope of _____________ is used in the treatment of cancer.

a) hydrogen

b) cobalt

c) iodine

Q.4: The mass of an __________ of any natural element is taken as the average mass of all the naturally occuring atoms of that element.

a) electron

b) atom

c) none

Q.5: Atoms of different elements with different atomic numbers but same mass number are known as _____________.

a) Isotopes

b) Isobars

c) None

Q.6: Which of the following statements are true ?

i) The shells of an atom are categorised as K,L,M,N…

ii) The three isotopes of a hydrogen atom are protium, deuterium and tritium.

iii) Isobars and Isotopes are same.

a) i and iii

b) i and ii

c) ii and iii

Q.7: An isotope of ___________ is used to treat goitre.

a) iron

b) iodine

c) zinc

Q.8: Elements are defined by the number of __________ they possess.

a) electrons

b) protons

c) neutrons

Q.9: Which of the following element’s valency is 0 ?

a) Lithium

b) Neon

c) Aluminium

Q.10: Which of the following element’s atomic number is 15 ?

a) Argon

b) Phosphorous

c) Baron

Answers:

  1. b
  2. b
  3. b
  4. b
  5. b
  6. b
  7. b
  8. b
  9. b
  10. b

Published by Priya Prakash

In the midst of winter, i found there was within me an invincible summer ~ Albert Camus

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