2. mmcl2003 1111 2222 3333 4444 5555 6666 7777 8888 9999 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 29 28 30

3. mmcl2003 How are elements arranged in the periodic table? Elements are arranged in terms of their chemical properties answer 1.

4. mmcl2003 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. mmcl2003 What are the NOBLE GASES? The very unreactive Group 8 (or 0) elements. 3. answer

6. mmcl2003 What is the name given to the centre of an atom? The NUCLEUS 4. answer

7. mmcl2003 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. mmcl2003 What is a nucleus? The very small positively charged centre of atom. It contains protons and neutrons. 6. answer

9. mmcl2003 What charge has the centre of an atom? Positive charge 7. answer

10. mmcl2003 What is the electron arrangement of an atom with 14 electrons? 2,8,4 8. answer

11. mmcl2003 From the data book, what is the electron arrangement for sodium? 2,8,1 9. answer

12. mmcl2003 What is the maximum number of electrons that each electron energy level can accommodate? 1st-2 electrons 2nd-8 electrons 3rd-8 (for the 1 st 20 elements) 10. answer

13. mmcl2003 Where are the electrons found in an atom? Electrons are arranged in different energy levels around the nucleus of the atom 11. answer

14. mmcl2003 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 12. answer

15. mmcl2003 Why are atoms electrically neutral? The number of positively charged protons equals the number of negatively charged electrons 13. answer

16. mmcl2003 What information does the group number give? The group number = the number of electrons in the outer energy level 14. answer

17. mmcl2003 What is the mass and charge of a proton? Mass Charge Proton 1 amu + 15. answer

18. mmcl2003 What is the mass and charge of a electron? Mass Charge Electron almost 0 - 16. answer

19. mmcl2003 What is the mass and charge of a neutron? Mass Charge Neutron 1 amu 0 17. answer

20. mmcl2003 Why is the relative atomic mass of an element rarely a whole number? RAM is an AVERAGE, but, it is often close to a whole number as one isotope is usually much more common than the others 18. answer

21. mmcl2003 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. 19. answer

22. mmcl2003 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 20. answer

23. mmcl2003 What is the MASS NUMBER of an atom? No of Protons + No of Neutrons 21. answer

24. mmcl2003 What is an ION? A charged particle formed when electrons are gained or lost by an atom 22. answer

25. mmcl2003 How is a positive ion formed? An outer electron(s) is lost from an atom 23. answer

26. mmcl2003 How is a negative ion formed? An electron(s) is gained by an atom 24. answer

27. mmcl2003 Calculate the number of protons, neutrons and electrons in 31 P 15 protons 16 neutrons 15 electrons 25. answer

28. mmcl2003 Calculate the number of protons, neutrons and electrons in 23 Na + 11 protons 12 neutrons 10 electron 26. answer

29. mmcl2003 Calculate the number of protons, neutrons and electrons in 16 O 2- 8 protons 8 neutrons 10 electrons 27. answer

30. mmcl2003 What is a MOLECULE? A group of non-metal atoms joined together by covalent bonds. 28. answer

31. mmcl2003 What is RELATIVE ATOMIC MASS (RAM)? Average mass of the atoms of an element allowing for different isotopes and their percentage proportions 29. answer

32. mmcl2003 What are ISOTOPES? Atoms with the same atomic number ( same element ) but different mass numbers, due to a different number of neutrons in the nucleus 30. answer