What do you expect the nature of hydrides is if formed by elements of atomic numbers 15, 19, 23 and 44 with dihydrogen? Compare their behaviour towards water.

How do you test the nature of the solution formed by dissolving CaO in water? what is the nature of the solution?

An element has atomic number 19. Where would you expect this element in the period table and why ?

An element has atomic number 19. where would you expect this element in the periodic table and Why ?

An element has atomic number 17. Where would you expect this element in the periodic table ? Why .

Which of the following elements A , B , C , D and E with atomic numbers 3 , 11 , 15 , 18 , and 19 respectively belong to the same group ?

What do you understand by the term non stoichiometric hydrides? Do you expect this type of the hydrides to be formed by alkali metals? Justify answer.

Elements A, B and C belong to the same period in the long form of the periodic table. The nature of the oxides of A, B and C is amphoteric basic and acidic respectively. The correct order of the atomic numbers of these elements is

An atom has electronic configuration 2, 8, 7. (a) What is the atomic number of this element ? (b) To which of the following elements would it be chemically simlar ? (Atomic numbers are given in parentheses.) N(7) F(9) P(15) Ar(18)

In the modern periodic table, the elements are placed in order to increasing atomic number. These have been numerous designs of the table over the years but the most common is the long form of periodic table. The long form of periodic table shows all the elements in numerical order. Write the expected ground state electronic configuration of the element with one unpaired 5p electron that forms a covalent compound with fluorine.