SELECT * FROM question_mgmt as q WHERE id=3156 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=2 AND subId=9 AND chapterId=52 and ex_no='1' AND status=1 ORDER BY CAST(question_no AS UNSIGNED) CBSE Free NCERT Solution of 11th chemistry The p Block Elements explain why is there a phenomenal decrease in ioni

Question:

Explain why is there a phenomenal decrease in ionisation enthalpy from carbon to silicon?

Answer:

Ionisation enthalpy of carbon (the first element of group 14) is very high (1086 kJ/mol). This is expected because of its small size. However, on moving down the group to silicon, there is sharp decrease in the enthalpy (786 kJ). This is because of an appreciable increase in the atomic sizes of elements on moving down the group.


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