Do the element lithium, sodium and potassium from a Dobereiner's triad?

What are the causes for which lithium shows some anomalous properties from the other elements in the group I.

What property do all elements in the same column of the periodic Table as fluorine have in common?

Give reasons: (b)Sodium,potassium and lithium are stored under oil.

Give the names of the elements present in the following compounds. Potassium sulphate.

Give the chemical equation for the reaction be-tween a saturated solution of sodium dichro-mate and potassium chloride.

What property do all elements in the same column of the periodic Table as boron have in common?