Fig. 12.1 shows a diagram to represent a helium atom, and an incomplete key.
Complete the key in Fig. 12.1. State the name of each particle.
The table in Fig. 12.2 compares two isotopes of helium.
number of protons | ||
number of neutrons |
Fig 12.2
For each isotope, write the number of protons and the number of neutrons in the correct places in the table.
The nucleus of the helium atom in (a) is the same as an α-particle.
(i) Describe the penetrating ability of α-particles.
[1]
(ii) Explain why it is dangerous to swallow a source that emits α-particles.
[2]
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