हिंदी

Electronic Configuration of Elements of Group 16, 17 and 18

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Estimated time: 5 minutes
Maharashtra State Board: Class 12

Key Points: Electronic Configuration

Group Name General Configuration Valence e⁻ Tendency Key Property Example Special Note
16 Chalcogens ns² np⁴ 6 Gain 2 e⁻ Moderately reactive O→2s²2p⁴
S→3s²3p⁴
Incomplete octet
17 Halogens ns² np⁵ 7 Gain 1 e⁻ Highly reactive Cl→3s²3p⁵ Br→4s²4p⁵ Very high electron affinity
18 Noble gases ns² np⁶ (except He) 8 Stable (no gain/loss) Inert / least reactive Ne→2s²2p⁶ Ar→3s²3p⁶ He = 1s² 
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