Atomic Structure

2. The number of protons in an atom is given by this number
4. Number of electrons in the valence shell of a group 1 atom
6. A substance made of one type of atom
10. Maximum number of electrons in every subsequent electron shell after the first
11. The maximum number of electrons in the first shell
12. Oxygen, fluorine and neon are all examples of
13. Mendeleev organised his periodic table by atomic mass and similar chemical ...?
15. Subatomic particles with negligible mass and a -1 charge
17. The name for a row in the periodic table

1. Atoms with the same proton number (same element) but different numbers of neutrons
3. The number of electrons in the valence (outermost) shell of a group 7 atom
5. Most of the mass of an atom is contained here
7. The metals in the central block of the periodic table are called ... metals
8. Lithium, copper and iron are all examples of
9. The name for a column in the periodic table
14. The charge on an atom
16. The name of the gases found in group 0