Which of the following is not a pure form of a substance ? A. Element
B. Atom
C. Molecule
D. Mixture
E. Compound

Which of the following is not a pure form of a substance ?

C.mixture

Explanation:

since mixture is created due to one or more than two element,compound,molecule or atom.

option D . mixture.

Explanation:

Mixture is not a pure form of a substance .

it is formed when two particles mixed together in one substance

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it is to be noted that an alpha particle is an helium nucleus. so it contains 2 protons 2 neutrons and has a mass number of 4. when alpha decay particles are ejected from the nucleus it gets transformed into an atom which has atomic number less than 2 and a mass number less than 4.

an equation that could represent alpha decay is radium 226 decay of alpha particle forms radon 222.

→

we can conclude that the melting point of table salt is above room temperature (it's actually 801 deg c). the melting point of mercury must be below room temperature (- 39 deg c).