To attain eight electrons in their valence shell means ………..
a) octet rule
b) duplet rule
c) Aufbau principle
d) Hund’s rule
Oxygen atom shares or gains………….. electrons to attain stability.
a) 3
b) 2
c) 5
d) 1
Explanation:Oxygen has six electrons in its valence shell so it requires two electrons to completes its octet.
To attain two electrons in their valence shell means ………..
a) octet rule
b) duplet rule
c) Aufbau principle
d) Hund’s rule
Helium is stable atom because it contains …………electrons in their valence shell.
a) 8
b) 6
c) 2
d) 1
The elements in the group VIII of the periodic table are called ………..
a) alkali metals
b) noble gases
c) nitrogen family
d) noble gases
Noble gases are also called ………gases.
a) reactive
b) inert
c) a & b both
d) none
Explanation:They are inert gases due to their complete octet or duplet and they don’t take part in chemical reaction.
