Question

ca, sr, Ba are examples for​

Answer 1

Answer  Group 2A — The Alkaline Earth Metals. Group 2A (or IIA) of the periodic table are the alkaline earth metals: beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra). They are harder and less reactive than the alkali metals of Group

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Explanation:

Answer 2

Answer:

They are the dobereiner's triads .

Explanation:

Calcium (Ca)

Strontium (Sr)

Barium (Ba)

Dobereiner's triads - he showed that when the three elements in a triad were written in the order of increasing atomic masses , the atomic mass of middle element was roughly the average of the atomic masses of other two elements.

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