Bismuth
The 88th element on the periodic table is radium. The symbol for radium is Ra. This element is radioactive and emits three types of radiation.
Th is element number 90 on the periodic table It is thorium, it is in the Actinides, and it is radioactive
The radioactive element polonium has an isotope 21084Po.
Element 99 on the periodic table is einsteinium.
Radioactive elements exist in all groups of the periodic table.
Lanthanides and Actinides probably
Element 36 is Krypton and is a radioactive gas.
Hydrogen is the first chemical element in the Periodic Table of Mendeleev.
who introduced the first Periodic Table
The first element in the periodic table of Mendeleev is hydrogen, not carbon.
Hydrogen is the first element on periodic table. Its atomic number is 1.
The first element of the Mendeleev's periodic table is hydrogen (H).