Question

2. Write short answers for the following:
1. Why was Newland's law rejected ?
2. Why did Mendeleev left gaps in his periodic table ?
3. Name the light element having three isotopes.
4. Define atomic weight.
5. What do you understand by chemically similar elements ?​

Answer 1

Answer:

1 Newland's law rejected because it follows lighter elements only after discovery heavy elements it rejected.

2 because discovery of new elements placed this gap.

3 Hydrogen have three isotopes protium deuterium tritium.

4 atomic weight = no. of neutrons + no. of protons.

5 similarity depends up elements present in same block and same group eg. K Na shows similarities.