Here it is
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In case of B - Its ground state is 1s² 2s² 2p_x¹
Excited state is   1s² 2s² 2p_x¹  2p_y ¹
B uses sp2 hybridization in which it is uses excited state EC
In case of Be Its ground state is 1s² 2s²
Excited state is   1s² 2s² 2p_x¹
However with N and P they uses only ground state as it provides all s and p orbitals for hybridization.
1s² 2s² 2p_x¹ 2p_y¹ 2p_z¹
Watch these videoes to know more about ground state and excited state of elements
https://youtu.be/FWuHEAolcs4
https://youtu.be/dWdwXmz8ju8
https://youtu.be/aAv2J9r_-tg