1. Which one of the followings has sharp and fixed melting point?

2. The unique property of an element is called:

3. Piece of matter in pure form is called:

4. An atom or group of atoms having odd number of electrons is called:

5. A substance whose atoms have the same atomic number is called:

6. One mole of any material contains chemical units equal to:

7. An atom or group of atoms having positive charge on it is called:

8. Which one of the followings shows the simplest whole number ratio of atoms in a substance?

9. The number of particles in one mole of a substance is called:

10. Anything that has mass and occupies space is called: