Question

Make a chart which shows the name of the element, valency, atomic
number ,electronic configuration in the 2nd row of the modern periodic table and
arrange these elements in ascending order of atomic mass .

Answer 1

Explanation:

Element valency A.No Ecn

Li. 1. 3. He.2S¹

Be. 2. 4. He. 2S²

B. 3. 5. He. 2S² 2p¹

C. 4. 6. He. 2s² 2p²

N. 3. 7. He. 2S² 2P³

O. 2 8. He. 2S² 2p⁴

F. 1 9. He. 2s²2p⁵

Ne. 0. 10 1s²2s²2p⁶