Every time I write about particle physics, I encounter a moment of uncertainty about a quantity that, at first glance, ought to be clear. How many kinds of elementary particles should I say there are?

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Particle physics is the study of the elementary building blocks of matter and radiation and their interaction. The fundamental particles are summarised by the standard model. This includes leptons ...

Watch this video to find out how to use the periodic table to identify the atomic and mass numbers of an element. For example, the atomic number of sodium is 11. Every sodium atom has 11 protons and ...

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1 mol is the amount of substance that contains the same number of particles as there are atoms in 12.0 g of carbon-12.