PERIODIC TABLE PUZLE

ACROSS :

1. The number of electron in the outermost shell

5. Distance from the outermost electron to the nucleus

10. Particles which cannot be influenced by magnetic orelectric field

11. The total number of proton and neutron contained in the nucleus of an atom

12. Horizontal row in the periodic table of the elements

13. Name of group IA

17. Atom with the same number of neutron but different atomic numbers

18. The term of the cathode rays found by thomson

DOWN :

2. The tendency of an atom to capture electron

3. Positive ion

4. Charged atom

6. Atoms with different atomic number, but the same number

7. The inventor of trans uranium

8. Atoms with the same number of proton, but differentnumber of electron

9. Classification of chemical elements by Dobereiner
11. Group of elements which are shiny, can be processed as metalwork,

and can conduct electricity

14. Name group II A