Why na is softer than k
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Why is sodium a soft metal?
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Sushovan Shakya, High School Student. (2016-present)
Answered Aug 10

Sodium belongs to Group I in the Modern Periodic Table, which consists of Alkali Metals.
All the elements of this group, except Hydrogen, are extremely reactive metals, the reactivity increasing as we go down the group.
Alkali metals have large atomic size due to the weak force of attraction between the nucleus and the valence electron. This means that alkali metals quickly lose their only valence electron, hence being more reactive. And, since reactivity increases as we go down the group, this also means that the atomic size would be larger.
Sodium has larger atomic size because of less force of attraction between the valence electron and the nucleus, hence it is soft. You can also find that Potassium is more softer than Sodium, Rubidium being more softer than Potassium, and this goes on.
Still have a question? Ask your own!
Start with: What, How, Why, Where, etc
2 ANSWERS

Sushovan Shakya, High School Student. (2016-present)
Answered Aug 10

Sodium belongs to Group I in the Modern Periodic Table, which consists of Alkali Metals.
All the elements of this group, except Hydrogen, are extremely reactive metals, the reactivity increasing as we go down the group.
Alkali metals have large atomic size due to the weak force of attraction between the nucleus and the valence electron. This means that alkali metals quickly lose their only valence electron, hence being more reactive. And, since reactivity increases as we go down the group, this also means that the atomic size would be larger.
Sodium has larger atomic size because of less force of attraction between the valence electron and the nucleus, hence it is soft. You can also find that Potassium is more softer than Sodium, Rubidium being more softer than Potassium, and this goes on.
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