2. Calderglen High School 1111 2222 3333 4444 5555 6666 7777 8888 9999 10 11 12 13 14 15 16 17 18 19 20 21 22 23

3. Calderglen High School How are elements arranged in the periodic table? Elements are arranged in terms of their chemical properties answer 1.

4. Calderglen High School What is similar about elements in the same group (column) of the periodic table? Elements in the same group show similar chemical properties 2. answer

5. Calderglen High School What are the NOBLE GASES? The very unreactive Group 0 elements. 3. answer

6. Calderglen High School What is the name given to the centre of an atom? The NUCLEUS 4. answer

7. Calderglen High School Describe the structure of an atom? An atom is a very small particle with a positively charged centre (nucleus) surrounded by moving negatively charged electrons 5. answer

8. Calderglen High School What is a nucleus? The very small positively charged centre of atom. It contains protons and neutrons. 6. answer

9. Calderglen High School What charge has the centre of an atom? Positive charge 7. answer

10. Calderglen High School Where are the electrons found in an atom? Outside the nucleus (in energy levels) 8. answer

11. Calderglen High School What is ATOMIC NUMBER? The number of protons (and so also electrons) in an atom. It is the number by which elements are arranged in the periodic table 9. answer

12. Calderglen High School Why are atoms electrically neutral? The number of positively charged protons equals the number of negatively charged electrons 10. answer

13. Calderglen High School What information does the group number give? The group number = the number of electrons in the outer energy level 11. answer

14. Calderglen High School What is the mass and charge of a proton? Mass Charge Proton 1 amu + 12. answer

15. Calderglen High School What is the mass and charge of a electron? Mass Charge Electron almost 0 - 13. answer

16. Calderglen High School What is the mass and charge of a neutron? Mass Charge Neutron 1 amu 0 14. answer

17. Calderglen High School What is the same about the electron arrangement of atoms in the same group? They have the same number of electrons in their outer energy levels. 15. answer

18. Calderglen High School What is the connection between the electron arrangement and the chemical properties of an element? Elements with the same number of outer electrons have similar chemical properties 16. answer

19. Calderglen High School What is the MASS NUMBER of an atom? No of Protons + No of Neutrons 17. answer

20. Calderglen High School What is an ION? A charged particle formed when electrons are gained or lost by an atom 18. answer

21. Calderglen High School How is a positive ion formed? An outer electron(s) is lost from an atom 19. answer

22. Calderglen High School How is a negative ion formed? An electron(s) is gained by an atom 20. answer

23. Calderglen High School What is a MOLECULE? A group of non-metal atoms joined together by covalent bonds. 21. answer

24. Calderglen High School What is a diatomic? A molecule containing two atoms. e.g. H 2, HCl. 22. answer

25. Calderglen High School Which elements exist as diatomic molecules? Hydrogen, Nitrogen, Oxygen, Fluorine, Chlorine, Bromine, Iodine. 23. answer