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Chemistry

science

QuestionAnswer
Periodic Table a chart of the elements showing the repeating pattern of their properties.
Atomic mass the average mass of one atom of an element.
Nucleus the central core of an atom containing protons and usually neutrons.
Protons a small, positively charged particle in the nucleus of the atom.
Neutrons a small particle in the nucleus of the atom, with no electrical charge.
Electrons a tiny, negatively charged particle that moves around the nucleus of an atom.
Atomic number This number indicates the number of protons in a atom
Lewis Dot Structure a model of the atom which shows the valence electrons surrounding the element’s chemical symbol.
Valence electrons the electrons in the outermost electron level or orbital (highest energy level) of the electron
Period a horizontal row of elements in the periodic table.
family/group elements in the same vertical column of the periodic table.
Metalloid an element that has some of the characteristics of metals and some of the characteristics of nonmetals.
Malleable a term used to describe a material that can be hammered or rolled into shape.
Ductile a term used to describe a material that can be pulled out into a long wire.
Alkali metals an element in group 1 of the periodic table. So reactive that they never are found uncombined in nature. soft and shiny and have one valence electrons.
Alkaline earth metals an element in group 2 of the periodic table.
Transition metals an element in groups 3 through 12 of the periodic table
Element a pure substance that cannot be broken down. (atoms make up elements)
Compound 2 or more elements chemically combine..
Positive Having a deficiency of electrons; having a higher electric potential
Negative Having a surplus of electrons; having a lower electric potential
Neutral Not helping or supporting either of two opposing sides.
2 First row
8 Second row
18 Third row
32 Fourth row
Created by: abby101