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20 terms

book k chp 3 vocab

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nucleus
the central core of an atom containing protons and usually neutrons
proton
a small positively charged particle in the nucleus of the atom
neutron
a small particle in the nucleus of the atom with no electrical charge
electron
a tiny negatively charged particle that moves around the nucleus of an atom
atomic number
the number of protons in the nucleus of an atom
isotope
an atom with same number of protons and a different number of neutrons from other atoms
mass number
the sum of protons and neutrons in the nucleus of an atom
model
object that helps explain ideas about the natural world
atomic mass
the average mass of all the isotopes of an element
periodic table
a chart of the elements showing the repeating pattern of their properties
chemical symbol
a one or two letter representation of an element
period
a horizontal row of elements in the periodic table
group
elements in the same vertical column of the periodic table also called a family
metal
a class of elements characterized by physical properties that include shininess, malleability, ductility,and conductivity
malleable
a term used to describe material that can be pounded into shapes
ductile
a term used to describe a material that can be pulled out into a long wire
conductivity
the ability of an object to transfer heat or electricity to another object
reactivity
the ease and speed with an element combines, or reacts, with other elements and compounds
corrosion
the gradual wearing away of a metal element due to a chemical reaction
alkali metal
an element in group 1 of the periodic table