Reactive Metal Sodium (Na)

Sodium is the sixth most common element on Earth, and makes up 2.6% of the Earth's crust.

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Properties of Sodium:

It is soft in nature that can be cut with a knife

It is a highly reactive metal.

It is important for many different functions of the human body. It helps cells to transmit nerve signals and regulate water levels in tissues and blood.

Electro valency of Sodium is +1

Valence electron of Sodium is 1

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Some more details on >>> https://en.wikipedia.org/wiki/Sodium