Question

mention one similarity between the properties of hydrogen with group 1 element ant two similarities with group 17.

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Answer 1

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➥Similar to alkali metals, hydrogen has 1 electron in its outermost shell and can form compounds with non-metals (such as HCl, etc.). However, it has non-metallic character, is a gas (while alkali metals are solid) and cannot lose its valence electron.

➥Group 1 of the periodic table includes hydrogen and the alkali metals. Because they have just one valence electron, group 1 elements are very reactive.

➥Hydrogen has only 1 valence electron in its outermost shell. Like the Group I Alkali metals it has valency = 1 i.e it can lose electron. Similarly, it can gain one electron to achieve stability. Like Group 17 elements,it can gain electron.

➥Hydrogen is a nonmetal and is placed above group in the periodic table because it has ns1 electron configuration like the alkali metals. However, it varies greatly from the alkali metals as it forms cations (H+) more reluctantly than the other alkali metals.

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