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Periods

Which quantum...

Question

Which quantum number determines the radius of an atom?

A

n

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B

n and l

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C

m

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D

l

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Solution

The correct option is A
n

Principal quantum number(n) signifies the distance from the nucleus and the size of an atom.

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Q. Assertion :In hydrogen and hydrogen like species, orbital energy depends only on the quantum number n whereas in multi-electron atom it depends on quantum numbers n and l. Reason: The principal quantum number determines the size and the energy of the orbital.

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b. n= 3, l=2 and m= -1

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