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Diagonal Relationship in the Periodic Table

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Diagonal Relationship in the Periodic Table

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Questions and Answers

Which property of alkali metals makes them highly reactive?

Large size and low ionization enthalpy

Small size and low ionization enthalpy (correct)

Small size and high ionization enthalpy

Large size and high ionization enthalpy

Why do the alkali metals tarnish in dry air?

Formation of superoxides

Formation of hydroxides

Reaction with nitrogen

Formation of oxides (correct)

Which alkali metal forms a peroxide when reacting with oxygen?

Lithium

Rubidium

Sodium (correct)

Potassium

What is the trend in hydration enthalpies of alkali metal ions as you move down the group?

Decrease Signup and view all the answers

Which alkali metal has the lightest density?

Potassium Signup and view all the answers

What characteristic property allows caesium and potassium to be used as electrodes in photoelectric cells?

Ability to lose electrons when irradiated with light Signup and view all the answers

Which element shows similarities to magnesium in its properties?

Lithium Signup and view all the answers

What is the common valence electron configuration for all alkali metals?

ns1 Signup and view all the answers

Why are alkali metals considered the most electropositive metals?

They have a loosely held s-electron in the outermost valence shell. Signup and view all the answers

What is responsible for the regular trends in physical and chemical properties of alkali metals?

Increasing atomic number Signup and view all the answers

Why are alkali metals never found in free state in nature?

They are too reactive and readily lose electrons. Signup and view all the answers

What property of alkali metal atoms increases with atomic number in a period?

Increase in size Signup and view all the answers