Question

suddha madam asked student to place 3 element namely lithium sodium and potassium in one groupor say triad. 1) how could she place all the 3 elem5in one group. 2 ) what is the name of this group? state the property of prpperty of element of this group.​

Answer 1

Answer:

She could place it by Wolfgang Dobereiner's triads

The arithmetic mean of lithium and pottassium is sodium

Answer 2

Answer:

Triads by doerinlees periodic classification