Chemistry
Suspension particles have the size between

10–8 – 10–10cm
10–5 – 10–7cm
10–1 – 10–2 cm
10–2 – 10–4 cm

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Chemistry
The mass number of a nucleus is

always more than the atomic weight
the sum of the number of protons and neutrons present in the nucleus
always less than its atomic number
a fraction

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