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chemistry end of the year exam for year 7 cambridge IGCSE lower secondary

1. Write the chemical symbols of the following atoms [10] Example: Flourine  = F 1. Hydrogen                             .…………….. 2. Sodium                                ………………   3. chlorine                               ….…………… 4. Magnesium                        … Read More »chemistry end of the year exam for year 7 cambridge IGCSE lower secondary