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A period 3 element is one of the chemical elements in the third row (or period) of the periodic table of the elements.

These are:

Chemical elements in the third period

Group	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18
# Name	11 Na	12 Mg											13 Al	14 Si	15 P	16 S	17 Cl	18 Ar
e--conf.

Chemical series of the periodic table

Alkali metals	Alkaline earth metals	Lanthanides	Actinides	Transition metals
Poor metals	Metalloids	Nonmetals	Halogens	Noble gases

Period 1 element - Period 2 element - Period 3 element - Period 4 element - Period 5 element - Period 6 element - Period 7 element - Period 8 element

Periodic tables
Standard table | Vertical table | Table with names | Names and atomic masses (large) | Names and atomic masses (small) | Names and atomic masses (text only) | Inline F-block | Elements to 218 | Electron configurations | Metals and nonmetals | Table by blocks | Alternatives
Lists of elements
Name | Atomic symbol | Atomic number | Boiling point | Melting point | Density | Atomic mass
Groups:   1 -  2 -  3 -  4 -  5 -  6 -  7 -  8 -  9 - 10 - 11 - 12 - 13 - 14 - 15 - 16 - 17 - 18
Periods:  1  -  2  -  3  -  4  -  5  -  6  -  7  -  8  -  9
Series:   Alkalis  -  Alkaline earths  -  Lanthanides  -  Actinides  -  Transition metals  -  Poor metals  -  Metalloids  -  Nonmetals  -  Halogens  -  Noble gases
Blocks:  s-block  -  p-block  -  d-block  -  f-block  -  g-block

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ast:Elementos del periodu 3 ca:Elements del període 3 de:Periode-3-Element es:Elementos del periodo 3 eo:Elemento de periodo 3 fr:Éléments de la période 3 it:Elementi del periodo 3 lmo:Elemeent del períut 3 nl:Periode-3-element ja:第3周期元素 sr:3. периода хемијских елемената sv:Grundämnen i period 3 th:ธาตุคาบ 3 tr:3. periyot elementleri zh:第3周期元素