It is the least abundant of the stable halogens , being the sixty-first most abundant element. (wikipedia.org)
Element1
Magnesium is the eighth most abundant element in the earth's crust although not found in it's elemental form. (shef.ac.uk)
Isotopes5
The isotopes of cerium range in atomic weight from 119 u (119Ce) to 157 u (157Ce). (wikipedia.org)
Lanthanum-139 the most abundant of the lanthanum isotopes. (periodic-table.com)
Naturally occurring erbium is composed of 6 stable isotopes, Er-162, Er-164, Er-166, Er-167, Er-168, and Er-170 with Er-166 being the most abundant (33.503% natural abundance). (scientificlib.com)
Although Potassium only has two stable isotopes (K-39 and K-41), the long-lived radioisotope K-40 is often also regarded as a stable isotope. (shef.ac.uk)
Naturally occurring dysprosium is composed of seven isotopes , the most abundant of which is 164 Dy. (cloudfront.net)
Potassium2
Potassium is a metal and is the seventh most abundant and makes up about 1.5 % by weight of the earth's crust. (shef.ac.uk)
K are found in all potassium, and it is the most common radioisotope in the human body. (wiki2.org)
Metal1
It is ranked as the twenty-eighth most abundant metal in the earth's crust and is thrice (39 mg/kg of the earth's crust) as abundant as lead. (periodic-table.com)