Name the next element after phosphorous in modern period table?

Indicate the group number and period number of phosphorous in the modern periodic table

Name the last element of third period?

What is modern periodic law?

Observe the following elements in the modern periodic table?

What is the basis of modern periodic table?

Who gave modern periodic law ?

Name the elements discovered after mendeleev's periodic table?

Indicate the atomic number of elements of period 3 of modern periodic table: elements forming positive ions

Indicate the atomic number of elements of period 3 of modern periodic table:element forming negative ions.

Two elements X and Y have atomic numbers 12 and 16 respectively. Write the electronic configuration for these elements. To which period of the modern perioidic table to these two elements belong? What type of bond will be formed between them and why?