Question

v tut uuwnward pull by the earth and can escape the
ape the tabl
earth forever is called the escape velocity.
Chapter 2: Periodic Classification of Elements
mod
(1) State Dobereiner's law of triads giving one example.
their
table
name
(2 marks)
Ans. Dobereiner made groups of three elements each, having
similar chemical properties and called them triads. He arranged the
three elements in a triad in an increasing order of atomic mass and (
showed that the atomic mass of the middle element was approximately D.
equal to the mean of the atomic masses of the other two elements. A
Examples : Lithium (Li), Sodiun (Na), Potassium (K) form into a
Dobereiner's triad.
differe​

Answer 1

Answer:

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