Which of the following is the correct electron configuration for the bromide ion, Br-?
a) [Ar] 4s24p5
b) [Ar] 4s23d104p5
c) [Ar] 4s23d104p6
d) [Ar] 4s23d104p65s1
e) [Ar] 4s23d103p6
Which of the following elements has the largest number of electrons for which the principal quantum number, n, is 3?
Which is the first element to have 4d electrons in its electron configuration?