Question

important definitions from periodic classification of element lesson​

Answer 1

Answer:

You should know periodic table

Explanation:

You should elements till 30

Answer 2

Answer:

Explanation:

1)dobberniers triad

2) newland's law of octaves

3)modern periodic law

4)atomicity

5)valancy and valance electrons

.... ..

Hp this hlps uhhh.....