Explain why hydrogen is best placed separately in the periodic table.

The two isotopes of chlorine have atomic mass 35 u and 37 u. Should they be placed in separate slots in the periodic table ?

Hydrogen can be placed in group 17 pf the periodic table because

Hydrogen is reagarded as a rogue elements in the periodic table. Explain

Actinoids and lanthanoids are placed respectively in ____________ of the periodic table.

Why hydrogen should be placed in group I ?

Hydrogen has a dual position in the periodic table. (True / False)

(a) Explain why the first period of the modern periodic table has only two elements whereas second period has eight elements (b) Why do elements in the same group show similar properties but the elements in different groups show different properties? (c) For each of the following triads, name the element with the characteristics specified below: (d) State on reason for keeping fluorine and chlorine in the same group of the periodic table. (e) What are the merits of the moderns periodic table of elements?