Easiest trick to learn Valency of Elements 1 - 30 - Dr K

In less than 2 minutes, you'll remember the valency of elements 1 - 30! We'll use 2 valency tricks - valency for the first 20 elements and valency for elements 21 - 30. The main group elements (first 20 elements) are very easy and straight forward. The transition elements (elements 21 - 30) are not as straightforward as they have multiple valency.
🕑 Here's when you'll find:
0:00 Valency of elements 1 - 20
0:40 Valency of elements 21 - 30
1:42 Hack for polar or nonpolar molecule
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