Period 3 element 

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.


Element categories in the periodic table

Metals Metalloids Nonmetals Unknown
Alkali metals Alkaline earth metals Inner transition elements Transition elements Other metals Other nonmetals Halogens Noble gases
Lanthanides Actinides

Mnemonic

A mnemonic (attributed to Richard Feynman)citation needed for the elements of Period 3 (more precisely, starting from Neon, the last element of Period 2, and ending at Chlorine, the second-to-last element of Period 3) is:

"Nena, m'gal, sips chlorine"

(i.e., Ne-Na Mg-Al Si-P-S Chlorine).

v • d • e
Periodic tables
Layouts
Lists of elements by
Groups
1 (Alkalis) · 2 (Alkaline earths) · 3 · 4 · 5 · 6 · 7 · 8 · 9 · 10 · 11 · 12 · 13 · 14 · 15 (Pnictogens) · 16 (Chalcogens) · 17 (Halogens) · 18 (Noble gases)
Periods:
1 · 2 · 3 · 4 · 5 · 6 · 7 · 8
Other element categories
Blocks