other govt exam FCI Assistant Grade 3 (AG III) Phase I & II Mock Test General Science Chemistry Chemical Bond and Molecular Structure

निम्नलिखित युग्म में तत्व और संयोजकता इलेक्ट्रॉन हैं, कौन-सा एक युग्म गलत है?

1
Tl-3
2
Al-3
3
Sr-4
4
Br-7
5
S-6
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