Two elements X and Y are isotonic having atomic weight 54 and 56 respectively. If the atomic number of X is 26, then the atomic number of Y will be

Two nuclides A and B are isotonic .Their mass number are 76 and 77 respectively .If the atomic number of A is 32 then the atomic number of B will be

The nucleides X and Y are isotonic to each other with mass numbers 70 and 72 respectively. If the atomic number of X is 34, then that of Y would be

Two elements X and Y have atomic numbers 10 and 14 respectively. Identify the group numbers of these elements in the periodic table.

If W is atomic weight and N is the atomic number of an element, then

Two elements X and Y have atomic number 3 and 5 respectively, give the formula of their chlorides.

Atomic number of an element is 26. the element shows

Two elements X and Y have the same atomic mass but this atomic number are 20 and 21 respectively X and Y are