chemistry revision

chemistry revision

1. what is the name of the central part of the atom?

   • Nucleus

2. What is the name of the particle with no charge?

   • Neutron

3. What is the name of the particle with no charge?

   • Electron

4. A particle of ammonia is called a molecule.

5. Methane is a compound

6. The name of a diamond element is called carbon.

7. Covalent bonds are very strong.

8. C2

9. C1

10. Water is a compound.

11. The atomic number of the oxygen atom shown about 8.

12. Oxygen atoms with different numbers of neutrons are called isotopes.

13. Mendeleev first arranged the elements in order of their atomic weight .

14. Mendeleev then placed elements wit there similar properties in columns called groups .

15. Mendeleev left a gap