Elements having 5 valence electrons are placed in____.

Q. Assertion: Elements having atomic number 3 and 11 belong to the same group.

Reason: Elements having same number of valence electrons are placed in the same group.

Q. When elements are placed in the order of their increasing atomic number, the elements having the same number of valence shell electrons is repeated in such a way, so as to fall under :

Q. Set of elements having one electron in their valence shell are:

Q. The pair of elements having same number of valence electrons are _________.

Q.

Fill in the blanks with correct option.

1. Properties of element are periodic function of their _______ (atomic mass/ atomic number/ relative atomic mass).

2. The elements having same _______(electronic configuration/ number of valence electrons) are placed in the same group.

3. In the modern periodic table the elements placed below sodium are expected to have________(lower/ higher) electronegativity than sodium and the elements placed above chlorine are expected to have ______(lower/ higher) ionization energy than chlorine.