Answer:
4.
L ° (dot in the middle)
5.
6. The elements sodium (Na), potassium (K) and so on that belong to Group 1 will have similar properties as that of lithium (Li). elements which are having similar properties with beryllium are magnesium and aluminium. Same number of atoms on the outer shell, will have similar melting and boiling properties
Step-by-step explanation:
image is #5