(connections academy chemistry)if you get it right i’ll give brainliest

A) 36.0 x 100 /2 = 1800 g Be

n = m / MM 
stoichiometry 1:1 
atomic mass of Be= 100 g/ mol

b) theoretical yield

The answers are c c i hope this helps

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.