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Question
why is boiling point of antimony greater than that of bismuth? why does melting point increase upto arsenic and decrease upto bismuth?
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Solution
Group 15 elements consists of 5 valence electrons. Now the melting point of group 15 elements increases as we move down the group from N to As these elements have tendency to involve all the 5 electron both s and p orbital in bonding but as we move down the group from Sb to Bi, the s orbital electron do not involve in bonding due to inert pair effect which doesn't allow extra two electron to involve in bonding . Thus Melting and boiling point decreases as move from Sb to Bi.
Group 15 elements consists of 5 valence electrons. Now the melting point of group 15 elements increases as we move down the group from N to As these elements have tendency to involve all the 5 electron both s and p orbital in bonding but as we move down the group from Sb to Bi, the s orbital electron do not involve in bonding due to inert pair effect which doesn't allow extra two electron to involve in bonding . Thus Melting and boiling point decreases as move from Sb to Bi.
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