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Further detail
The conventional representation of a nucleus identifies its element and gives its proton number and mass number.
Experimental evidence, including scattering experiments and James Chadwick’s work, led scientists to change the atomic model over time.
1. Isotopes are distinguished from atoms of different elements by which characteristics?
2. Regarding the activity of a radioactive source:
3. Which characteristics distinguish alpha, beta and gamma radiation?
Where are an atom’s protons and neutrons located?
In its nucleus.
Where are an atom’s electrons located?
Around the nucleus.
What defines isotopes of the same element?
They have the same number of protons but different numbers of neutrons.
What does the activity of a radioactive source measure?
The rate at which its unstable nuclei decay.
In what unit is radioactive activity measured?
Becquerels (Bq).
Which instrument measures a radioactive source’s activity?
A Geiger–Müller tube.
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