Question

pls define halogens, alkali metals and earth alkaline metals according to class nine​

Answer 1

• halogens, the most reactive non metals, exist in the 17th group of the modern periodic table.

• alkali metals are the most reactive metals existing in the 1st group of the modern periodic table.. they have 1 valence electron which they can easily donate to complete their octet....

• alkaline earth metals exist in the 2nd group, are less reactive than alkali metals and form dipositive ions ....

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