book k chp 3 vocab

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20 terms

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

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