Question

Dobereiner laid down the…..rule.a) periodic b)modern periodic c) trictavesad d)octaves​

Answer 1

Answer:

Dobereiner laid down the trictavesad rule

that is the triads

Good morning

have a great day

Answer 2

Dobereiner laid down the c) trictavesad rule.

• Johann Wolfgang Döbereiner (a German chemist) formed triads of elements with similar properties.
• According to the rule, the mean of the atomic weights of the heaviest and the lightest element of a triad was equal to the atomic weight of the middle element.
• The modern periodic law (properties of elements are a function of atomic number) was given by Henry Moseley.
• The octave rule (the properties of the first element was similar to the eighth element when they were arranged in increasing order of their atomic weights.