CAIE A-Level Chemistry AS 1.1.4 Distribution of Mass and Charge Within an Atom Questions

Practise describing where an atom’s mass and positive or negative charge are located, using the nuclear model and subatomic particles.

Exam points

Describe that most atomic mass is concentrated in the nucleus because protons and neutrons are nuclear particles.

[Maximum number: 2]

All the Group 2 elements except beryllium have more than one stable isotope.

Beryllium exists as the single isotope ${ }_{4}^{9} \mathrm{Be}$ .

Describe the distribution of mass within an atom of ${ }_{4}^{9} \mathrm{Be}$ .

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