Radioactive sources emit radiation when they decay. State the names of three types of radioactive emission.
Radioactive emissions have differing characteristics. One characteristic is their ionising effect.
Complete the statement about ionisation, using words from the box. The words can be used once, more than once or not at all.
electrons negatively neutrons positively neutrally protons |
When atoms are ionised,
............................... may be removed,
leaving ............................... charged atoms (ions),
or ............................... may be gained,
forming ............................... charged atoms (ions).
Polonium-210 has a half-life of 140 days. A sample of polonium-210 has 8.0 × 1010 atoms. Calculate the number of polonium-210 atoms remaining in the sample after 280 days.
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