Atomic structure of small- and large-period elements
Answers are for parents and teachers.
1
Write the full electron formula of aluminium (Z = 13).
1s² 2s² 2p⁶ 3s² 3p¹
2
How many shells and how many outer electrons does a calcium atom (Z = 20) have?
4 shells, 2 outer electrons.
3
Check the electron sum for selenium (Z = 34): 2, 8, 18, 6.
34
4
Is vanadium (Z = 23) a d- or p-element? Its shortened formula?
d-element; [Ar] 3d³ 4s²
5
State the period and group of caesium, [Xe] 6s¹.
Period 6, main subgroup of Group I.