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Revision:Periodic Table Practice QuestionsTSR Wiki > Study Help > Subjects and Revision > Revision Notes > Chemistry > Periodic Table Practice Questions Which is the most unreactive group of the periodic table and why? Group 0 / group 8 The Noble Gases because they have a full outer shell of electrons and are therefore stable.
'Name 3 halogens Chlorine, Fluorine and Iodine (also Astatine and bromine).
How many electrons do halogens have on their outer shell? 7
What charge do ions of group 6 have? 2- because they have to gain 2 electrons to have a full outer shell.
How many electrons does Cl have on its outer shell? 7
What is the mass of 0.25 moles of sulphur ions? 0.25 x 32 8g
How many moles is 6g of Magnesium? 6/24 0.25 mols
How many protons, neutrons and electrons in a Li atom? Protons3 Neutrons4 Electrons3
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