periodicoccurring at regular intervals
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appearing or occurring at intervals
elementa component or constituent of a whole
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a part or aspect of something
isotopeeach of two or more forms of the same element
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two or more kinds of the same chemical element having different numbers of neutrons
madnessstate of being mentally ill, especially severely
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the state of having a serious mental illness
alchemya seemingly magical process of transformation, creation, or combination
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a form of chemistry and speculative philosophy practiced in the Middle Ages and the Renaissance and concerned principally with discovering methods for transmuting baser metals into gold
protona subatomic particle occurring in all atomic nuclei
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a stable particle with positive charge equal to the negative charge of an electron
neutrona subatomic particle of about the same mass as a proton but without an electric charge
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a subatomic particle with no net electric charge and a mass slightly larger than that of a proton
electrona subatomic particle with a negative electric charge
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a stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids
nucleusthe central and most important part of a particular thing
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the central and most important part of an object, movement, or group, forming the basis for its activity and growth