Valency of hydrogen and Potassium is _____
- -1 and +1
- +1 for both
- +1 and +4
- +1 and -1
Explanation
- Valency is the combining capacity of an element (how many electrons it can gain, lose or share).
Hydrogen (H):
- Atomic number = 1 → has 1 electron.
- Needs 1 more to complete its outer shell → shares or loses 1.
- So, its valency is +1.
Potassium (K):
- Atomic number = 19 → 1 electron in outer shell.
- Easily loses 1 electron to become stable → forms K⁺.
- So, its valency is +1.
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