Assign the position of the element having outer electronic configuration:
(i) ns²np⁴ for n = 3
(ii) (n-1)d²ns² for n = 4, and
(iii) (n-2) f⁷ (n-1)d¹ns² for n = 6, in the periodic table.

Give the atomic number and electronic configuration of the following elements:

(i) The third alkali metal

(ii) The second transition element

(iii) The fourth noble gas

(iv) The first halogen.

Elements A, B, C and D have atomic numbers 7, 19, 29 and 36 respectively. Write the electronic configuration and also predict their period, group and block.

The elements Z = 107 and Z = 109 have been made recently; element Z = 108 has not been made. Indicate the groups in which you will have the above elements.

An element belongs to third period of the p-block. It has four valence electrons. Predict its group. How many unpaired electrons does it has?

96.

The elements with Z = 117 and 120 have not yet been discovered. In which family/group would you place these elements. Also give the electronic configuration in each case.

What are metals, non-metals and metalloids?

Arrange the following elements in the increasing order of their metallic character: Si, Be, Mg, Na, P.

What are periodic properties of the elements? Name a few important periodic properties.