Question

Write any 4 properties of Alkali Metals.

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Answer 1

They are found in the 1st group of the periodic table
They are soft and not very dense
They have the lowest ionisaon energies of all elements
They are very reactive

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Answer 2

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SOME PROPERTIES OF ALKALI METALS :

ATOMIC AND IONIC RADII -

• These have highest atomic radii in their respective periods due to least nuclear charge.
• It increses down the group due to increase in no. of shells and screening effect.

IONISATION ENERGY :

• They have low ionisation energy due to bigger atomic size.
• It decreases down the group due to increase in atomic size and decrease in effective nuclear charge.

MELTING POINT AND BOILING POINT :

• These have poor melting point and boiling point due to their poor strength of metallic bond.
• Melting point and Boiling point decreases down the group with increase in size.

ELECTROPOSITIVE AND METALLIC CHARACTER :

• These are highly electropositive and metallic in nature due to low ionization energy.
• Electropositivity and metallic character increases down the group due to increase in ionization energy.

EXTRA POINTS :

☆ They have general valence shell electronic configuration $\sf\blue{ {ns}^{1} }$

☆ Alkali Metals consists of Lithium, Sodium, Potassium, Rubidium, Ceasium and Francium.

☆ Francium is the most reactive in this group.

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