Cambridge IGCSE Chemistry practice
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3
Paper
1
Marks
Topic
Isotopes
Exam-style question
Identifying elements using their symbols and atomic numbers.
Description
The following symbols are given: C, Cl, Na, and H. Identify the atomic numbers for each of these elements.
Identify the atomic number of sodium.
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Description
Each element is represented by a unique symbol. For example, 'H' for hydrogen, 'O' for oxygen, and 'Fe' for iron. The atomic number indicates the number of protons, while the mass number indicates the total number of protons and neutrons.
State the symbol for oxygen.
Aim for approximately 1 distinct marking point.