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.

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

The outermost electronic configuration of an element is 3s^2 3p^4 a) Find the atomic number of this element. b) Write down the group in which this element belongs to? c) Write down the outermost subshell elctronic configuration of the inert gas which belongs to the same period of the given element.

11,17,10 are the atomic number of elements X,Y and Z: Write down the oxidation numbers of the elements in the compound formed by any two of the element. Write the subshell electronic configuration of both ions.

The atomic number of an element is 23. Write the subshell electronic configuration and find the group period and block of the element?

Fill in the blanks in the following table showing how the properties varies down the group and across the period in a periodic table.

The Bohr model of an atom is given below. Analyse it and find out the following The period and group of the element

Mendeleev arranged the elements in the order of increasing atomic weights. a) Write down the merits of Mendeleevis periodic table. b) What are the demerits of Mendeleev's periodic table?