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1. The neutral sub-atomic particle was discovered by
A. Rutherford
B. Bohr
C. J.Chadwick
D. Thomson
2. Neutron has
A. Positive charge
B. Negative charge
C. No charge
D. Both charges
3. Neutrons are present in the nucleus of all atoms except
A. Hydrogen
B. Helium
C. Oxygen
D. Carbon
4. The mass of an atom is mainly due to
A. Electrons
B. Nucleus
C. Orbitals
D. Empty space
5. The distribution of electrons in orbits is given by
A. Thomson and Bohr
B. Bohr and Bury
C. Rutherford and Bohr
D. Dalton and Thomson
6. The maximum number of electrons in a shell is given by the formula
A. n²
B. 2n²
C. n³
D. 3n²
7. The first shell (K) can hold a maximum of
A. 1 electron
B. 2 electrons
C. 4 electrons
D. 8 electrons
8. The L shell can hold a maximum of
A. 4 electrons
B. 6 electrons
C. 8 electrons
D. 10 electrons
9. The outermost shell can have a maximum of
A. 2 electrons
B. 6 electrons
C. 8 electrons
D. 18 electrons
10. Shells are filled
A. Randomly
B. Step-wise from inner to outer
C. From outer to inner
D. In any order
11. The electrons in the outermost shell are called
A. Neutrons
B. Valence electrons
C. Protons
D. Core electrons
12. An atom with 8 electrons in the outermost shell has
A. High reactivity
B. Valency zero
C. Valency eight
D. Half-filled shell
13. The tendency of atoms to achieve 8 electrons in their outermost shell is called
A. Octet rule
B. Pairing rule
C. Nucleus rule
D. Stability rule
14. Atoms achieve octet by
A. Sharing
B. Losing
C. Gaining electrons
D. All of these
15. The valency of sodium is
A. 0
B. 1
C. 2
D. 3
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