Chemistry C4 0.0 / 5 ? ChemistryC4GCSEOCR Created by: shanaefCreated on: 14-12-15 17:28 Name 4 things about the nucleus of an atom 1. Middle of the Atom 2. Contains Protons and Neutrons 3. Positive charge 4. Almost whole mass of atom concentrated in nucleus 1 of 26 Name 4 things about the electrons in an atom 1. Move around Nucleus 2. Negatively charged 3. Virtually no mass 4. Arranged in shells 2 of 26 What decides in an atom what element it is? The number of protons 3 of 26 State the 4 state symbols and say what they are (s) - solid (g) - gas (l) - liquid (aq) - dissolved in water 4 of 26 Name 3 three elements that give off distinctive colours when heated Lithium - Red flame Sodium - Yellow/Orange flame Potassium - Lilac flame 5 of 26 What is a Line spectrum? When heated the electrons in an atom are excited and release energy as light. The wavelengths can be recorded as a line spectrum 6 of 26 Why do different elements emit different wavelengths of light? Each element has a different electron arrangement affecting there wavelengths 7 of 26 How can Line spectrums be used to identify elements? Each element has a different pattern of wavelengths which means a different line spectrum for each. 8 of 26 Name the three chemists in order of time who tried to organise the periodic table Dobereiner, Newlands and Dmitri Mendeleev 9 of 26 On what side are the metals and non-metals on the periodic table? Right hand side = non-metals Left hand side = metals 10 of 26 Is the proton number the higher or lower number on an element in the periodic table? Lower 11 of 26 How many electrons are allowed in the 1st,2nd and 3rd shells? 1st = 2 2nd = 8 3rd = 8 12 of 26 What number do you use to work out the electron configuration of an element? Proton Number - the lower number 13 of 26 How are ions made? Ions are made when atoms gain or lose electrons by trying to get a full outer shell 14 of 26 What charge is an atom if they lose an electron while trying to gain a full outer shell? Positive - it becomes a positive ion 15 of 26 What charge is an atom if they gain an electron while trying to gain a full outer shell? Negative - it becomes a negative ion 16 of 26 Give an example of a group that will get rid of an electron to gain a full outer shell? Group 1 17 of 26 Give an example of a group that will gain an electron to gain a full outer shell? Group 7 18 of 26 What is ionic bonding? It is a process in which an atom gives up an electron and another gains that same electron, both to gain full outer shells 19 of 26 What are Group 1 & 7 usually called? Group 1 - The alkali metals Group 7 - The halogens 20 of 26 Name 3 similarities between the elements in group 1 1. One outer shell electron 2. Very reactive 3. Shiny when freshly cut 21 of 26 What happens when a group 1 element reacts with cold water? They react vigorously and produce Hydrogen. The reaction makes an alkaline solution. 22 of 26 What happens when a group 1 element reacts with chlorine? They react vigorously and produce colourless crystalline salts 23 of 26 Do the elements in group 1 become more or less reactive as you go down the group? More reactive 24 of 26 Name a similarity between the elements in group 7 They all have seven outer electrons 25 of 26 Do the elements in group 7 become more or less reactive as you go down the group? Less reactive 26 of 26
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