Given the electron configuration of B is 1s²2s²2p¹, how many valence electrons does B have?

Answer:

From 1s²2s²2p¹,we can say that B has three valence electrons.

The electrons of valence shell are called valence electrons.Valence shell means the outermost shell.

Here 1s²2s²2p¹,the outermost shell is the 2nd shell.In 2nd shell,we get (2+1 =3) three valence electrons.