Why is the 1st ionisation potential of B...

Why is the 1st ionisation potential of B less than that of Be ?

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CHHAYA PUBLICATION-MODEL QUESTIONS PAPER -SET II ( SECTION II ) ( GROUP C)

Why does 2d-orbital not exits ?
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Write the postulates of Bohr's atomic model .
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Why is the 1st ionisation potential of B less than that of Be ?
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Write the IUPAC name of CH(3) - CH(2)- CH (CH(3))- COOH
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