Question

fill ups
1. Number of valence electrons in neon atom is
2. protons and neutrons are present in
3. Extra nuclear space in an atom is
4.Discovery of electrons were made by the study of ------ rays
5. A subatomic particle having unit mass but no charge is called------

Answer 1

1. 10
2. Nucleus
3. Electron
4. Cathode ray
5. Neutron

Answer 2

1) number of valence electrons in neon atom are 0
2) protons and neutrons are present in an atom.
3) extranuclear space in an atom are tiny electrons.
4) Discovery of electrons were made by the study of cathode rays.
5) A subatomic particle having unit mass but no charge is called neutron.