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Chapter 5 key terms
key terms
25
Chemistry
11th Grade
10/19/2006

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Term
Alkali metal
Definition
group 1A elements
Term
alkaline earth metal
Definition
group 2A elements
Term
atom
Definition
the smallest particle you can divide an element into that keeps the properties of that element
Term
atomic mass
Definition
the average mass of the atoms in a naturally occurring sample of the element
Term
atomic mass unit (AMU)
Definition
1/12 the mass of a carbon-12 atom
standard for measuring the mass of atoms
Term
atomic number
Definition
# of protons in the nucleus of an atom of that element
Term
cathode ray
Definition
a stream of electrons produced at the negative electrode (cathode) of a tube containing a gas at low pressure
Term
Dalton's atomic theory (4 parts)
Definition
1) all elements are composed of tiny indivisible particles called atoms
2) Atoms of the same element are identical. The atoms of any one element are different from those of any other element
3) Atoms of different elements can combine with one another in simple whole number ratios to form compounds
4) chemical reactions occur when atoms are seperated, joined, or rearranged. Atoms of one element are not changed into atoms of another by chemical reactions
Term
electrons
Definition
negatively charged subatomic particles
Term
group
Definition
vertical column in periodic table
Term
halogen
Definition
nonmetals of group 7A
Term
isotope
Definition
atoms that have the same number of protons, but different numbers of neutrons
Term
mass number
Definition
total number of protons and neutrons in an atom
Term
metal
Definition
high electrical conductivity and high luster when clean. ductile, malleable
Term
metalloid
Definition
properties that are intermediate between those of metals and nonmetals
Term
neutron
Definition
subatomic particles with no charge but mass nearly equal to that of a proton
Term
noble gas
Definition
nonmetals of group O
undergo few chemical reactions (stable)
Term
nonmetal
Definition
elements that are nonlustrous and poor conductors of electricity
Term
nucleus
Definition
central core of an atom that is composed of protons and neutrons
Term
period
Definition
horizontal rows of periodic table
Term
periodic law
Definition
when the elements are arranged in order of increasing atomic number, there is a periodic repetition of their physical and chemical properties. elements in the same period have similar chemical and physical properties
Term
periodic table
Definition
arrangement of elements according to similar properties
Term
proton
Definition
positively charged subatomic particles
Term
representative element
Definition
group A elements exhibit a wide range of physical and chemical properties
Term
transition metal
Definition
group B elements
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