Period 4 element

Period 4 element
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Period_4_element".

A period 4 element is one of the chemical elements in the fourth row (or period) of the periodic table of the elements.

These are:

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**Chemical elements in the fourth period**
Group	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18
Atomic number Name	19 K	20 Ca	21 Sc	22 Ti	23 V	24 Cr	25 Mn	26 Fe	27 Co	28 Ni	29 Cu	30 Zn	31 Ga	32 Ge	33 As	34 Se	35 Br	36 Kr
electron configuration all begin with [Ar]	4s¹	4s²	3d¹4s²	3d²4s²	3d³4s²	3d⁵4s¹	3d⁵4s²	3d⁶4s²	3d⁷4s²	3d⁸4s²	3d⁹4s¹	3d¹⁰4s²	3d¹⁰4s²4p¹	3d¹⁰4s²4p²	3d¹⁰4s²4p³	3d¹⁰4s²4p⁴	3d¹⁰4s²4p⁵	3d¹⁰4s²4p⁶

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

v • d • e Periodic tables

Layouts	Standard · Vertical · Full names · Names and atomic masses · Text for last · Huge table · Metals and nonmetals · Blocks · Valences · Inline f-block · 218 elements · Electron configurations · Atomic masses · Electronegativities · 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

Element categories	Alkalis · Alkaline earths · Lanthanides · Actinides · Transition metals · Metals · Metalloids · Nonmetals · Halogens · Noble gases

Blocks	s-block · p-block · d-block · f-block · g-block

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