Year 9 Chemistry

1. Magnesium, Calcium, Strontium, Barium and Radium belong to group two
3. is from group 7 and so it can be classified as a nonmetal
5. particles are found orbiting the nucleus in shells electrons
7. are three main states of matter: Gas, liquid and _____ solid
9. group number to which Helium, Neon, Argon, Krypton, Xenon and Radon belong to is group eight
11. is found in this state gas
13. shells have letters assigned to them. Therefore, an element with four shells will have ____ shells klmn
14. that are made up of more than one type of atom that is not in a fixed ratio is called a mixture
16. from groups 5-8 tend to form negatively charged ions anions
17. is from group 2 and so it can be classified as a metal

2. protons and neutrons are found inside these atoms
4. electrons jump back to their original shell, they release energy in the form of light
6. Lithium, Sodium, Potassium, Rubidium, Caesium and Francium belong to group one
8. is commonly found in this state gas
10. alloy is a _______ of metals
12. is found in this state metal
15. is classified as this metalloid
18. negatively charged ion is called an anion
19. Boron is from period 2 then it means it has ___ electron shells two