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Niels Bohr put forward the theory that electrons move in certain orbits about the nucleus.

the temperature at which a substance changes phase from a liquid to a gas at a specific or fixed...

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small ball of chewed food mixed with saliva that is formed in the mouth, which is swallowed.

the process of separating bonded atoms from each other. The stronger the bond the more stable...

the amount of energy required to break a specific bond or the energy released when a specific...

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