Question : Which chemical element has an atomic number of 31?
Option 1: Aluminium
Option 2: Gallium
Option 3: Indium
Option 4: Thallium
Correct Answer: Gallium
Solution : The correct option is Gallium
The chemical element with atomic number 31 is gallium. Gallium is a soft, silvery metal that is classified as a post-transition metal. It is in the boron group of the periodic table and has the symbol Ga. Gallium does not react with air or water at room temperature. It forms alloys with many metals, and its alloy with arsenic (gallium arsenide) is used in electronic devices like solar cells, transistors, and LEDs.
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