Hydrogen resembles the properties of which two groups of the periodic table?

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**Solution:**

1. Hydrogen is unique in the periodic table because it can behave like elements from two different groups.

2. It can lose one electron to form a positive ion (H⁺), similar to alkali metals in **Group 1**.

3. It can also gain one electron to form a negative ion (H⁻), similar to halogens in **Group 17**.

4. Therefore, hydrogen shares properties with both **Group 1** and **Group 17** elements.

**Answer:** Group 1 and group 17

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