What is the number of valance electrons in the atoms of first element in a period ?

What property do all elements in the same column of the periodic table as born have in common ?

What property do all the elements on the same group of the periodic table as fluorine have in common ?

What is the usual number of valence electrons in the atoms of the last element in a period ?

State whether the following statement is true or False :

On going down in a group of the periodic table, the number of valence electrons increases.