Question

CORRECT ANSWER WILL BE MARK AS BRAINLIST !

Identify Dobereiner's triads from the following groups of elements having similar chemical properties. ( Use the steps to find it.). And draw the conclusion for discarding this classification.
1. Mg (24.3), Ca (40.1), Sr (87.6)

2. S (32.1), Se (79.0), Te (127.6)

3. Be (9.0), Mg (24.3), Ca (40.1)

4. CI(35.5), Br(79.9), I(216.9)​

Answer 1

Answer:

1st or 3rd element ke mass no. ko sum up kro sum up krke 2 se divide kro bech vale element ka mass no. nikal jayega that is Dobernors traids