Chemical Elements.com - Neutrons

* Information Valid for Most Abundant Isotope Only

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	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18
1	H																	He
1	0																	2
2	Li	Be											B	C	N	O	F	Ne
2	4	5											6	6	7	8	10	10
3	Na	Mg											Al	Si	P	S	Cl	Ar
3	12	12											14	14	16	16	18	22
4	K	Ca	Sc	Ti	V	Cr	Mn	Fe	Co	Ni	Cu	Zn	Ga	Ge	As	Se	Br	Kr
4	20	20	24	26	28	28	30	30	32	31	35	35	39	41	42	45	45	48
5	Rb	Sr	Y	Zr	Nb	Mo	Tc	Ru	Rh	Pd	Ag	Cd	In	Sn	Sb	Te	I	Xe
5	48	50	50	51	52	54	55	57	58	60	61	64	66	69	71	76	74	77
6	Cs	Ba	*	Hf	Ta	W	Re	Os	Ir	Pt	Au	Hg	Tl	Pb	Bi	Po	At	Rn
6	78	81		106	108	110	111	114	115	117	118	121	123	125	126	125	125	136
7	Fr	Ra	**	Rf	Db	Sg	Bh	Hs	Mt	Uun	Uuu	Uub
7	136	138		157	157	157	155	157	157	159	161	165

			*	La	Ce	Pr	Nd	Pm	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu
				82	82	82	84	84	88	89	93	94	97	98	99	100	103	104
			**	Ac	Th	Pa	U	Np	Pu	Am	Cm	Bk	Cf	Es	Fm	Md	No	Lr
				138	142	140	146	144	150	148	151	150	153	153	157	157	157	159

Element Groups (Families)
Alkali Earth	Alkaline Earth	Transition Metals
Rare Earth	Other Metals	Metalloids
Non-Metals	Halogens	Noble Gases