Atomic Number 12

Carbon 12 Atomic Mass
Atomic Number 120
Atomic Number 12 Mass Number 24
Atomic Number 127

Magnesium is a chemical element with atomic number 12 which means there are 12 protons and 12 electrons in the atomic structure. The chemical symbol for Magnesium is Mg. The atom consist of a small but massive nucleus surrounded by a cloud of rapidly moving electrons. The nucleus is composed of protons and neutrons.

1	Hydrogen	H
2	Helium	He
3	Lithium	Li
4	Beryllium	Be
5	Boron	B
6	Carbon	C
7	Nitrogen	N
8	Oxygen	O
9	Fluorine	F
10	Neon	Ne
11	Sodium	Na
12	Magnesium	Mg
13	Aluminum	Al
14	Silicon	Si
15	Phosphorus	P
16	Sulfur	S
17	Chlorine	Cl
18	Argon	Ar
19	Potassium	K
20	Calcium	Ca
21	Scandium	Sc
22	Titanium	Ti
23	Vanadium	V
24	Chromium	Cr
25	Manganese	Mn
26	Iron	Fe
27	Cobalt	Co
28	Nickel	Ni
29	Copper	Cu
30	Zinc	Zn

The number of occupied shells corresponds to the atom's atomic number. An electron configuration is unique to each element, much like its atomic spectrum. If the atom is electrically neutral, the number of electrons corresponds to the atom's atomic number.
Holonyms ('atomic number 12' is a substance of.): carnallite (a white or reddish mineral consisting of hydrous chlorides of potassium and magnesium; used as a fertilizer and as a source of potassium and magnesium).
Four elements P, Q, R and S have atomic numbers 12,13,14 and 15 respectively. Answer the following questions giving reasons: (i) What is the valency of Q? (ii) Classify these elements as metals and non-metals.

31	Gallium	Ga
32	Germanium	Ge
33	Arsenic	As
34	Selenium	Se
35	Bromine	Br
36	Krypton	Kr
37	Rubidium	Rb
38	Strontium	Sr
39	Yttrium	Y
40	Zirconium	Zr
41	Niobium	Nb
42	Molybdenum	Mo
43	Technetium	Tc
44	Ruthenium	Ru
45	Rhodium	Rh
46	Palladium	Pd
47	Silver	Ag
48	Cadmium	Cd
49	Indium	In
50	Tin	Sn
51	Antimony	Sb
52	Tellurium	Te
53	Iodine	I
54	Xenon	Xe
55	Cesium	Cs
56	Barium	Ba
57	Lanthanum	La
58	Cerium	Ce
59	Praseodymium	Pr
60	Neodymium	Nd

61	Promethium	Pm
62	Samarium	Sm
63	Europium	Eu
64	Gadolinium	Gd
65	Terbium	Tb
66	Dysprosium	Dy
67	Holmium	Ho
68	Erbium	Er
69	Thulium	Tm
70	Ytterbium	Yb
71	Lutetium	Lu
72	Hafnium	Hf
73	Tantalum	Ta
74	Tungsten	W
75	Rhenium	Re
76	Osmium	Os
77	Iridium	Ir
78	Platinum	Pt
79	Gold	Au
80	Mercury	Hg
81	Thallium	Tl
82	Lead	Pb
83	Bismuth	Bi
84	Polonium	Po
85	Astatine	At
86	Radon	Rn
87	Francium	Fr
88	Radium	Ra
89	Actinium	Ac

90	Thorium	Th
91	Protactinium	Pa
92	Uranium	U
93	Neptunium	Np
94	Plutonium	Pu
95	Americium	Am
96	Curium	Cm
97	Berkelium	Bk
98	Californium	Cf
99	Einsteinium	Es
100	Fermium	Fm
101	Mendelevium	Md
102	Nobelium	No
103	Lawrencium	Lr
104	Rutherfordium	Rf
105	Dubnium	Db
106	Seaborgium	Sg
107	Bohrium	Bh
108	Hassium	Hs
109	Meitnerium	Mt
110	Darmstadtium	Ds
111	Roentgenium	Rg
112	Copernicium	Cn
113	Nihonium	Nh
114	Flerovium	Fl
115	Moscovium	Mc
116	Livermorium	Lv
117	Tennessine	Ts
118	Oganesson	Og

Download a printable version of the Periodic Table of Elements in PDF format:

- Color: Basic / Advanced

- Black and White: Basic / Advanced

The following on-line games based on the Periodic Table of Elements are available:

- Element Flash Cards

- Element Hangman

- Element Matching

- Element Math

- Element Crossword Puzzles

- Element Concentration

- Element Balancing

- Element Word Scramble

The following paper-based activities are available:

- Element BINGO

Carbon 12 Atomic Mass

- Element Word Search

In addition to the information contained within the Periodic Table of Elements, the following articles may be helpful if you are writing a report about an element or if you are making a model of an atom:

- How to calculate the number of protons, neutrons and electrons in an atom of an element

- How to make a model of an atom

- How to draw an atom (video)

- How to read an electron configuration chart

Atomic Number 120

- A list of who discovered each element

Atomic Number 12 Mass Number 24

The information on this site has been compiled from a number of sources.

Atomic Number 127

For questions about this page, please contact Steve Gagnon.