1.Hydrogen forms hydrogen bonds with three elements which are nitrogen (N), oxygen(O), and fluorine (F).
Memory aid: Hydrogen is FON (fun).

2.Common names of homogenous aliphatic carboxylic acids, formic, acetic, propionic , Butyric, Valeric, Caproic.
Memory aid: Frogs Are Polite, Being Very Courteous.

3.Sequence of orbitals (s p d f g h I k)
Memory aid: Sober Physicists Don’t Find Giraffes Hiding in Kitchen.

4.First 10 elements (H, He, Li, Be, B, C, N, O, F, Ne)
Memory aid: Happy Henry Likes Beer But Could Not Obtain Four Nuts.

5.11 – 20 elements (Na, Mg, Al, Si, P, S, Cl, Ar, K, Ca)
Memory aid: Naughty Magpies Always Sing Perfect Songs Clawing Ants.

6.Group 1 (alkali metals) – H, Li, Na, K, Rb, Cs, Fr.
Memory aid: Highly Nasty Kids Rub Cats Fur.

7.Group 2 (alkaline earth metals) – Be, Mg, Ca, Sr, Ba, Ra.
Memory aid: Beer Mugs Can Serve Bar Rats.

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