Radioactive Element

There are stable and unstable atoms.  Stable atoms remain the same forever.  Radioactivity comes from unstable atoms having too much energy, breaking down and decaying.  During this process new atoms are created.

 

Radioactive Element
Element Name	Element Symbol	Atomic Number	Periodic Group Number	Periodic Period Number
Actinium	Ac	89	3	7
Americium	Am	95	-	7
Astatine	At	85	17	6
Berkelium	Bk	97	-	7
Bohrium	Bh	107	7	7
Californium	Cf	98	-	7
Curium	Cm	96	-	7
Darmstadtium	Ds	110	10	7
Dubnium	Db	105	5	7
Einsteinium	Es	99	-	7
Fermium	Fm	100	-	7
Francium	Fr	87	1	7
Hassium	Hs	108	8	7
Lawrencium	Lr	103	3	7
Meitnerium	Mt	109	9	7
Mendelevium	Md]	101	-	7
Neptunium	Np	93	-	7
Nobelium	No	102	-	7
Plutonium	Pu	94	-	7
Polonium	Po	84	16	6
Promethium	Pm	61	-	6
Protactinium	Pa	91	-	7
Radium	Ra	88	2	7
Radon	Rn	86	18	6
Roentgenium	Rg	111	11	7
Rutherfordium	Rf	104	4	7
Seaborgium	Sg	106	6	7
Technetium	Tc	43	7	5
Thorium	Th	90	-	7
Ununbium	Uub	112	12	7
Ununhexium	Uuh	116	16	7
Ununoctium	Uuo	118	18	7
Ununpentium	Uup	115	15	7
Ununquadium	Uuq	114	14	7
Ununseptium	Uus	117	17	7
Ununtrium	Uut	113	13	7
Uranium	U	92	-	7