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An atom is comprised of a central portion called a nucleus that contains protons and neutrons. Electrons orbit the nucleus and are typically found in a one-to-one ratio with protons. Different stable atomic configuration... More »

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The Bohr model of the hydrogen atom consists of a heavy proton orbited by an electron. It's best described as like a planet orbiting a star. Instead of gravity providing the attractive force to the system, the electron i... More »

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A molecule composed of two hydrogen atoms and one oxygen atom is a molecule of water. The structure of water is written as H20, which signifies that two hydrogen (H) atoms and one oxygen (O) atom make up the molecule. More »

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Atoms become radioactive when they have an excess of protons or neutrons in the nucleus, leading to unbalanced internal forces, which the atom balances by emitting radiation. Atoms with a different amount of neutrons or ... More »

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The subatomic particles of protons and neutrons are found in the nucleus of an atom. Protons are particles with a positive charge, while neutrons have no charge. Electrons, which have a negative charge, are particles tha... More »

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The compact, positively-charged nucleus of an atom contains two main types of subatomic particles: protons and neutrons. Orbiting the atom's nucleus are negatively-charged subatomic particles called electrons. The mass o... More »

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Both protons and neutrons are found in the nucleus of an atom. The third type of particle that an atom has, electrons, are found in orbitals outside of the nucleus. More »

www.reference.com Science Chemistry Atoms & Molecules