William adds two values following the rules for using significant figures in consultations. He should write the sum of these two numbers by using?

Heya dearfirst love doesn't matter what the it's just happen so we cannot say that minor in love with someone over 18 years old

The problem here is that according to aufbau principle before 3d orbital 4s subshell comes.after filling 3p orbital with electrons you have 4 electrons left, you place two in 4s with opposite spin and the other two in 3d in any of its two orbitals of total five orbitals with the same spin.

Answer trigonal pyramidal;