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

Write down the group and period of each element.

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.

Which element is next to lanthanum with atomic number 57 of group 6 in the periodic table?

The representation of Bohr model of elements with atomic number 3 to 9 in the second period of the periodic table. Is there are in the number of shells with the increase in atomic number?

Write the period number, group number and block of the element having atomic number 42

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

Write the atomic number of the element in the third period and group 17 of the period table.