SELECT * FROM question_mgmt as q WHERE id=1319 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=2 AND subId=9 AND chapterId=45 and ex_no='1' AND status=1 ORDER BY CAST(question_no AS UNSIGNED) CBSE Free NCERT Solution of 11th chemistry Chemical Bonding and Molecular Structure write lewis symbols for the following atoms and io

Question:

Write Lewis symbols for the following atoms and ions:

S and S2–; Al and Al3+; H and H–

Answer:

(i) S and S2– Electronic configuration of S is [Ne]10 3s23p4, i.e it has 6 electrons in its valence shell,therefore The Lewis dot symbol of sulphur (S) is . The dinegative charge shows that there will be two electrons more in addition to the six valence electrons. The electronic configuration can be [Ne]10 3s23p6, Hence, the Lewis dot symbol of S2– is .

 

(ii) Al and Al3+ The electronic configuration of Aluminium is [Ne]10 3s2 3p1, i.e the valence electron is 3,therefore The Lewis dot symbol of aluminium (Al) is . The tripositive charge on a species infers that it has donated its three electrons to other atom & its possible electronic configuration is [Ne]10 3s1. Hence, the Lewis dot symbol is .

 

(iii) H and H– Hydrogen has electronic configuration of 1s1,it has 1 electron in its valence shell. The Lewis dot symbol of hydrogen (H) is . The uninegative charge infers that there will be one electron more in addition to the one valence electron. The possible configuration may be 1s2. Hence, the Lewis dot symbol is .


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