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Chemistry: Periodic Law
Modern Chemistry Textbook
24
Chemistry
10th Grade
03/08/2012

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Term
periodic law
Definition
when elements are arranged in order of increasing atomic number, elements with similar properties appear at regular intervals.
Term
periodic table
Definition
the arrangement of elements in order of their atomic number so that elements with similar properties fall in the same column or group
Term
groups or families
Definition
18 vertical columns on the periodic table. Elements in the same group have similar physical and chemical properties.
Term
periods
Definition
7 horizontal rows; elements in the same period have different physical and chemical properties.
Term
s,p,d,f
Definition
What are the 4 sublevel blocks of the periodic table?
Term
Group 1
Definition
What group does Alkali metals belong in? They are highly reactive, silver, soft, never found free in nature, reacts violently with water, stored in kerosene, low melting points, and low density.
Term
Group 2
Definition
What group does Alkaline metals belong to? They are harder, denser, strong than alkalies, have higher melting points, less reactive but too reactive to be found in nature.
Term
s block elements
Definition
what block contains group 1-2?
Term
d block elements
Definition
what block contains group 3-12?
They are called transition elements. all metals, good conductors of electricity, high luster, less reactive than groups 1+2.
Term
p block elements
Definition
what block contains group 13-18?
Term
halogens
Definition
most reactive nonmetals
Term
metalloids
Definition
mostly brittle solids that have properties of both metals and nonmetals
Term
lanthanides
Definition
sandwiched between groups 3 and 4 in the 6th period; includes elements 57-71; shiny metals similar in reaction to the alkalines.
Term
actinides
Definition
sandwiched between groups 3 and 4 in the 7th period. includes elements 89-103; all are radioactive; 1st 4 found on earth, the remainder produced in laboratories.
Term
atomic radius
Definition
1/2 of the distance between the nuclei of identical atoms that are bonded together.
Term
ionization energy
Definition
the amount of energy needed to remove one electron from a neutral atom
Term
ion
Definition
an atom or group of atoms that has a positive or negative charge
Term
ionization
Definition
any process that results in the formation of an ion
Term
electron affinity
Definition
the energy that is associated with adding an electron to an atom.
Term
ionic energy
Definition
how the radii of an ion compares to the overall size of the parent atom before gaining or losing an electron
Term
cation
Definition
positive ion; formed by losing an electron; metals
Term
anion
Definition
negative ion; formed by gaining an electron; nonmetals
Term
electronegativity
Definition
a measure of the ability of an atom in a chemical compound to attract electrons
Term
valence electrons
Definition
the electrons available to be gained, lost, or shared in the formation of a chemical compound.
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