E-PolyLearning

556. Configuration of 18 electrons (e⁻) in third principal quantum level in s=2, p=8 and d will be
a. 18
b. 10
c. 12
d. 11
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Answer: (b).10

557. Elements with more than 57 electrons require
a. f-orbital
b. d-orbital
c. p-orbital
d. s-orbital
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Answer: (a).f-orbital

558. The concept of Avogadro's number was given by
a. Newland
b. Mendeleev
c. Amedeo Avogadro
d. Al- Razi
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Answer: (c).Amedeo Avogadro

559. Avogadro's number is the collection of particles
a. 6.02 x 10²³
b. 2.06 x10²³
c. 0.26 x 10²³
d. None of above
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Answer: (a).6.02 x 10²³

560. Noble gases have complete
a. Duplet
b. Octet
c. Shells
d. Sub-shells
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Answer: (b).Octet