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Some energetic particles that are close to the liquid surface will vaporise and constitute a vapour pressure above the liquid. The atom is the smallest unit of matter that can take part in a chemical change. The total pressure of the gas mixture will therefore be the sum of the pressures of the gases in the mixture. The number of positive charges in the nucleus of a neutral atom determines the number of electrons that surround the nucleus. Orbitals are simply regions in space around the nucleus where the probability of finding an electron is high, they are usually denoted by s,p;d, and f- orbitals.