Question

Name the two elements whose valencies are equal to their group number.

Answer 1

Answer:

all elements of group 1and group 2 have same valencies ex=sodium

Answer 2

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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