" 3.Write the period and group to which Mg element belongs "

State the period to which the above elements belong.

The atomic number of three elements are given below : Write the symbol of the element which belongs to (i) group 13, (ii) group 15, of the periodic table. State the period of the periodic table to which these elements belong. Give reason for your answer.

An element 'E' has atomic number 14. To which period this element belongs? How many number of elements are present in the period to which element ' E' belongs?

By referring to the modern periodic table, find out the group to which the above elements belong.

The electronic configuration of three elements X,Y and Z are given below: X 2 Y 2,6 Z 2,8,2 (i) Which element belongs to second period? (ii) Which element belongs to second group? (iii) Which element belongs to eighteenth group?

Consider the following elements: Na, Ca, Al, K,Mg, Li (a) Which of these elements belong to the same period of the periodic table? (b) Which of these elements belong to the same group of the periodic table?