Atomic numbers of two elements 'A' and 'B' are 31 and 41 respectively. Identify their group and period in the long form of the periodic table.

What is meant by groups and periods in the periodic table?

Identify the group and period of an element having atomic number (Z) 25 in the periodic table.

Name the elements included in the first period of the periodic table.

Write down the group and period of each element.

The atomic number of two elements are given below. Si-14 Ni-28 : Find out the group and period of each I element.

The physical and chemical properties of elements are periodic functions of their atomic numbers. a) The atomic number of an element 'X' is 19. Write the group number, period and block to which 'X' belong in the periodic table. b) Name the element with i) highest electronegativity and ii) highest electron gain enthalpy

Number of elements in the third period?