Question

#Identify Dobereiner triads from the following groups of elements having similar chemical properties.

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).​

Answer 1

Answer:

2) S(32.1) , SE(79) ,Te(127.6)