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Each atom contains an equal number of protons and electrons; these particles will be equal in value to an element's atomic number. For example, the element gold, or AU, has an atomic number of 79, meaning it has 79 proto... More »

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The atomic mass number consists of the number of protons and neutrons in an atom. The mass number is basically the amount of mass contained in an atom. More »

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A proton is a positively charged particle that is approximately 1.67*10^-27 kilograms in size. Protons can also be measured in Mega-Electron Volts. In Mega-Electron Volts, a proton is approximately equal to 938.27. More »

www.reference.com Science Chemistry Atoms & Molecules
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Elements are identified mainly through their atomic numbers, which are the number of protons present in an atom of an element. The periodic table gives each element with its atomic number and atomic weight. The atomic nu... More »

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The identity of an element is determined by the total number of protons present in the nucleus of an atom contained in that particular element. An atom is the smallest fundamental unit of an element. More »

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The atomic number is the value given to the number of protons in the nucleus of an atom. This value is the same as the charge value of an atom. More »

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The number of protons an atom has depends on what element it is. A hydrogen atom, for example, only has one proton. A nitrogen atom has 7 protons, an atom of antimony has 51 protons and an atom of radium has 88 protons. More »

www.reference.com Science Chemistry Atoms & Molecules