Shortcut Methods

IIT NEET

• 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).