Question

1. Justify the position of Hydrogen in the periodic table.
2. Why does hydrogen show dual nature ?
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Answer 1

Answer:

1)Hydrogen with atomic number 1 and electronic configuration 1s1 is the first element in the periodic table. It resembles alkali metals as well as halogens. Hence, its position is anomalous.

2)Hydrogen has a dual nature because it only has a single electron in its outer shell. Hydrogen atom can easily gain an electron to create a full outer shell ,like a typical halogen, or loose an electron ,like an alkali metal.