railway RRB Technician Grade 3 Mock Test 2024 General Science Chemistry Structure of Atom

एक तत्व का परमाणु क्रमांक 31 है उस ही वर्ग में उसके निकटतम ऊपर और नीचे आने वाले तत्वों के परमाणु क्रमांक होंगे:

1
क्रमशः 30, 32
2
क्रमशः 13, 49
3
क्रमशः 23, 49
4
क्रमशः 21, 41
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