20 words and definitions
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Atom | a part of a particle considered to be irreducible constituent of a specified system.
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| Element | A fundamental, essential or irreducible constituent of a composite entity.
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| Nucleous | the center of an atom
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| Electron Shell | a grouping of electrons surrounding the nucleus of an atom
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| Proton | a stable, positively charged subatomic particle in the Baryon family
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| Neutron | an electrically neutral subatomic particle in the Baryon family
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| Electron | A stable subatomic particle which and has a negative charge
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| Atomic Number | The number of protons in an atomic nucleous
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| Atomic Mass | the mass of an isotope of an element in atomic mass units
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| Valence Electron | an electron in the outer shell of an atom
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| Nonmetals | any element that lacks the physical and chemical properties of a metal
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| Metal | any electro positive element that usually has a shiny surface and good conductors of heat
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| Metalloid | a nonmetallic element that has some of the chemical properties of a metal
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| Group | a column in the periodic table in which elements are placed with the same properties
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| Period | Horizontal rows in the periodic table that represents the number of electron shells in that row
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| Transition Elements | elements whos atoms have an incomplete sub-shell
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| Representative Elements | elements in the first two groups and the last six of the periodic table
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| Ion | an atom or a group of atoms that has acquired a net electric charge by gaining or losing one or more electrons
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| Isotope | one of two or more atoms having the same atomic number but a different mass number
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| Law of Conservation of Mass | matter can't be made nor destroyed, it can only be changed physically
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