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electro affinity
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is a energy when an electron is added to an isolated atom in the gaseous state, i. e X(g) +e=X' (g)
first isolation energy
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is the energy needed to remove one electron from the atom which is in the gaseous state
electronegativity
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is ability for atraction to electrons, three most electronegativity electrons are F, N and O
melting point
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is the temperature when the substance change state of matter from liquid to state
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