Chemistry · Periodic Classification
एक तत्व 'X' के सबसे बाहरी कोश (outermost shell) में सात इलेक्ट्रॉन हैं। आधुनिक आवर्त सारणी के उस समूह का चयन कीजिए जिससे यह संबंधित है।
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समूह 17
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