UNIT FOUR: Groups in the periodic table 2.0 / 5 based on 1 rating ? ChemistryThe Periodic TableGCSEEdexcel Created by: PhoebeCreated on: 02-03-13 15:00 why is helium used in balloons? it is less dense than air. 1 of 9 If an element was described as being a reactive non-metal, which group would it belong to? group 7- the noble gases 2 of 9 How are the elements arranged in the modern periodic table? in order of atomic number 3 of 9 How do metals conduct electricity? In a sea of delocalised electrons 4 of 9 Which is the most reactive metal in group 1 and why? Potassium. The reactivity increases as you go down the group. 5 of 9 Which halogen has the darkest colour vapour and why? Bromine. The colour darkens as you go down the group. 6 of 9 What is the name for a reaction where a more reactive element removes a less reactive from its compound? Displacement. 7 of 9 Which is the most reactive halogen? Fluorine, because reactivity decreases as you go down the halogens. 8 of 9 What type of solutions do halogens form? ACIDIC. 9 of 9
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