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- 1. Multiple Choice
What is the maximum number of electrons in the M-shell of an atom?
6
8
18
32
- 2. Multiple Choice
What is the number of electrons in the valence shell of boron (B)?
1
0
3
2
- 3. Multiple Choice
Protium, Deuterium, and Tritium are types of _
isobar
isotope
isotone
isomer
- 4. Multiple Choice
Canal rays discovered by E. Goldstein contained particles that were:
neutral
positively charged
negatively charged
none of these
- 5. Multiple Choice
An atom has atomic mass 16u and atomic number of 8. How many neutrons are present in the atom?
10
7
8
9
- 6. Multiple Choice
The alpha particles used by Rutherford in his Gold Foil experiment are:
protons
helium atoms
helium ions
neutrons
- 7. Multiple Choice
What is the electronic configuration of Magnesium?
2, 3
2, 8, 1
2, 8, 2
2, 8, 3
- 8. Multiple Choice
Who discovered the existence of neutrons in the nucleus of an atom?
Chadwick
Rutherford
Bohr
Goldstein
- 9. Multiple Choice
What are defined as atoms having the same mass number but different atomic numbers?
isobar
isotope
isotone
isomer
- 10. Multiple Choice
An atom has atomic number 20, what is the number of electrons in the M-shell?
6
0
2
8
- 11. Multiple Choice
An atom has mass 15u. If the number of neutrons is 7, what is the number of electrons?
6
0
2
8
- 12. Multiple Choice
The ion of an element has 2 positive charges. The mass number of atom of this element is 26 and the number of neutrons is 13. What is the number of electrons in the ion?
10
11
12
13
- 13. Multiple Choice
Rutherford’s alpha particle scattering experiment led to the discovery of
proton
neutron
nucleus
electron
- 14. Multiple Choice
Elements having valency ‘one’ are :
always metals
always non-metals
always metalloids
either metals or non-metals
- 15. Multiple Choice
The number of valence electrons in a sulphide ion, S2–, is :
16
10
9
8
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