Name the two elements whose valencies are equal to their group number.
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Answer:
all elements of group 1and group 2 have same valencies ex=sodium
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Two elements that have valencies equal to their group number are hydrogen and lithium.
Explanation:
- Hydrogen’s valence is one, and it needs only one valence electron to fill its energy levels. Therefore Hydrogen can bond with many elements.
- Lithium has one valence electron, which means it has 2 in the inner shell and 1 in the outer shell. This is usually +1. However, there is one more possibility where lithium can lose the electron in the outer ring and can have valency -1.
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