1) Describe the 'plum pudding' model of the atom. 2) What is the centre of an atom called? 3) Which particles are found in the centre of an atom? 4) How many electrons can the first energy level hold? 5) What is the maximum number of electrons the second shell can hold? 6) Why are atoms neutral? 7) Define atomic number. 8) Define mass number. 9) Define isotopes. 10) How are positive ions formed? 11) Which type of element forms positive ions? 12) How are negative ions formed? 13) Which type of element forms negative ions? 14) Describe an ionic bond. 15) Describe a covalent bond. 16) Why was Mendeleev's version of the periodic table successful when other attempts were not? 17) What is formed when an alkali metal reacts with water? 18) Describe the trend of reactivity in Group 1. 19) Explain why the elements in Group 1 get more reactive down the group. 20) What is meant by the term ‘diatomic’? 21) Explain the trend in reactivity in Group 7. 22) Why are the noble gases unreactive? 23) What are the 3 special properties of transition metals? 24) Sodium chloride contains covalent bonding. True or false. How can you tell?

Atomic Structure and the Periodic Table

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