Across
- 3. Number Number of protons or electrons present in an atom.
- 4. Electrons Number of electrons donated or received by an atom to form stable configuration are known as Valence electrons.
- 6. A substance made up of more than one type of atoms in a definite proportion.
- 8. Table The table in which elements are arranged according to atomic number in different groups & periods.
- 9. A substance made up of one type of atom.
Down
- 1. a positively charged particle.
- 2. A negatively charged particle.
- 5. A neutral particle .
- 7. A substance made up of more than one elements or compounds in an indefinite proportion.