alleryStart learning →Chlorine (Z = 17) becomes Cl- by gaining how many electrons?
ANone
BOne
CTwo
DEight
Answer & Solution
Correct answer: B. One
1. Chlorine has 17 electrons (2, 8, 7).
2. It needs one more electron to complete its octet.
3. Gaining one electron gives a -1 charge.
4. So Cl- forms by gaining one electron.
_Source: Selina Concise Chemistry ICSE Class 9, Ch 4 'Atomic Structure'_
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