Shortcut Methods
IIT JEE Main
- Atomic number of the most abundant element in the Earth’s crust: Oxygen (O) has the atomic number 8.
- Group of elements known for reactivity and colored compounds: Transition metals.
- Element commonly used as a semiconductor in electronic devices: Silicon (Si).
- Two most common allotropes of carbon: Graphite and diamond.
- Noble gas used in advertising signs and fluorescent lighting: Neon (Ne).
CBSE Class 12
- General electronic configuration of group 1 elements: ns1.
- Group of elements known as the halogens: Group 17 elements.
- Three main oxidation states of nitrogen: -3, +3, and +5.
- Element that forms a white precipitate when reacted with sodium hydroxide solution: Aluminum (Al).
- Chemical formula of baking soda: NaHCO3 (sodium bicarbonate).
