Answer:
Calcium and barium
Explanation:
Krypton is a noble gas it do not take part in any reaction its physical and chemical property does not resembles to other atoms.
Hydrogen is the reducing gas its physical and chemical property does not resembles to other atoms.
Silicon is a semiconductor its physical and chemical property does not resembles to other atoms.
Calcium and Barium are placed in the same group 2 in the periodic table . Both are alkaline earth metal.
As both element are placed in the same group they have same physical and chemical properties.
Example:
- Electro-negativity of Calcium and barium are approximately same.
- Both have same oxidation states +2, both are strong basic oxide.
- Both are present in nature in solid state.
- Both are s- block element.
Thus, we can say Barium and Calcium have similar properties.
