Chemistry - 9 Chapter - 3Atomic StructureTest - 2

Chemistry - 9 Chapter - 3
Atomic Structure
Test - 2

1. What is an Orbit? Short..Answer....................................................... The --------- path of an electron around the nucleus

a) circular
b) curved
c) straight
d) zig zag

2. Define Electron?

a) It is the smallest negatively charged particle present in all kinds of atoms. Its mass is 9.1095 x 10^-31 kg and carries a negative charge of -1.602 x 10 ^-19 Coulombs
b) It is the smallest negatively charged particle present in all kinds of atoms. Its mass is 9.1095 x 10^-41 kg and carries a negative charge -1.602 x 10 ^-19 C .

3. The mass of an electron is about ______ times the mass of Hydrogen atom

a) 1/1480
b) 1/1540
c) 1/1840
d) 1/410

4. Why the mass of proton is equal to the mass of hydrogen nucleus?

a) Because Hydrogen nucleus has only one proton in it and one neutron.
b) Because Hydrogen nucleus has only one proton in it and no neutron.

5. Neutron is present in the nucleus of all atoms

a) False
b) True

6. Mass of Neutron is slightly more than that of a proton

a) True
b) False

7. An atom can neither be destroyed nor be formed through ordinary means?

a) True
b) False

8. An atom can be broken and energy obtained

a) True
b) False

9. Define Isotope?

a) Atoms of an element having the same atomic number but different mass number
b) Atoms of an element having the same atomic number and same mass number

10. Why atoms of an element can have different mass number?

a) Number of neutrons in atoms of same element can be different. Since neutron has maximum weight, the atom having more neutrons will be heavier ( larger mass number or Atomic Mass) than the one which is having less number of neutrons
b) Number of neutrons in atoms of same element are never different. Since neutron has maximum weight, the atom having more neutrons will be heavier ( larger mass number or Atomic Mass) than the one which is having less number of neutrons

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