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Which of the following element’s outermost orbits lst electron has magnetic quantum number m = 0 ?

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answer is A.

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Detailed Solution

Na: [Ne]3s¹ ---- Outer most orbit is 3s, m=0

O: [He]2s²2p⁴ ---- Outer most orbit is 2p, m=-1,0,+1

Cl: [Ne]3s¹3p⁵ ---- Outer most orbit is 3p, m=-1,0,+1

N: [He]2s²2p³ ---- Outer most orbit is 2p, m=-1,0,+1

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