23 terms

4.2 arranging the elements in the periodic table

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periodic table
An arrangement of the elements in which atomic weight increases from left to right and elements with similar properties appear in columns called families and groups.
periods
Horizontal rows in the periodic table
groups
Columns in the periodic table
transition elements
Elements in the middle of the periodic table, in groups 3-12.These are all metals.
lanthanides
14 metal elements with atomic numbers from 58 to 71
actinides
14 elements with the atomic numbers from 90-103. Most of these are man made and some are radioactive. (f-block)
element symbols
abbreviations for the chemical elements
alkali metals
Any metal in Group 1A of the periodic table
alkaline earth metals
Metallic elements in group 2 of the periodic table which are harder than the alkali metals and are also less reactive
halogens
A nonmetal in Group 7A of the periodic table
noble gases
Gaseous elements from group 8
atomic number
Number of protons in an atom nuclues
mass number
the sum of the number of neutrons and protons in an atomic nucleus
nucleus
the positively charged dense center of an atom
neutron
A subatomic particle that has no charge and that is found in the nucleus of an atom
proton
A subatomic particle that has a positive charge and that is found in the nucleus of an atom
electron
A subatomic particle that has a negative charge
valence electron
The electrons in the outermost shell (main energy level) of an atom; these are the electrons involved in forming bonds.
orbitals
Regions around the nucleus in which given electron or electron pair is likely to be found
electron shell numbers
2 in the first shell ,then 8 afterwards
group number
tells you how many electrons are in the valence shell
period number
tells you the amount of shells in each period( e.g. period 3 has 3 electron shells)
ions
Atoms that have gained or lost electrons

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