Cambridge O Level - GCE Guide
4 UCLES 2021 5070/22/M/J/21 2 Oxygen, sulfur, selenium, tellurium and polonium are in Group VI. (a) State the percentage composition by volume of oxygen in dry air. [1] (b) State one large-scale use for oxygen. [1] (c) Two isotopes of polonium are shown. 20 8 9 4Po 22 1 8 0 4Po (i) Explain why both isotopes have the same chemical properties. [1] (ii) Give one difference in the atomic structure ... ................
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