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15 Cards in this Set

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What is the periodic table?
arrangement of the elements in order of the atomic numbers
Aufbau principle -define
an electron occupies the lowest energy orbital that can receive it.
what are the horzontal rows called on the periodic table?
Periods . there are u perods of elements
What determines the period of an element?
the element's electron configuration.
What are the s-block?
chemically reactive metals.
What are group I elements?
the alkali metals.
What are group 11 elements?
the alkaline-earth metals.
what are the d-block elements?
Groups 3-12. transition elements.
What are the p-block elements?
Group 13-18 except not helium.
What are the halogens?
GRoup 17 the most reactive nonmetals.
What are f-block elements
Lanthanide and Actinides.
What is an atomic radius?
one-half the distance between the nuclei of identical atoms that are bonded together.
Do the atomic radii of main group elements increase or decrease as you go down a group?
The atomic radii of the elements increase as you go down.
What is an ion?
An atom or group of bonded atoms that has a positive or negative charge
What is ionization?
Process that results in the formation of an ion