CAIE A-Level Chemistry 1.1.4 Distribution of Mass and Charge

Practise describing where an atom’s mass and positive or negative charge are located.

Exam points

state that nearly all atomic mass is concentrated in the nucleus because it contains the nucleons
state that positive charge is concentrated in the protons inside the atomic nucleus
state that negative charge is distributed among electrons occupying the region outside the nucleus

[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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