Calcium
Argon is in the third period of the modern periodic table.
Neptunium is element 93.
Europium
Tantalum
The fifty-third element in the periodic table is iodine, which has the chemical symbol I and atomic number 53. It is a halogen with properties similar to chlorine and bromine.
Sulfur (S, element number 16) is on the third period of the periodic table.
Boron, aluminium, gallium ,indium ,thallium
Chlorine.
The element Silicon (Si) is in the third Period on the Periodic Table. It is also the second element in Group 14(4) - The Carbon Family. It has 14 electrons in 3 shells, with 4 electrons in the outer shell.
Argon (Ar, element number 18) is the last element in the third period of the periodic table.
sodium is the element
The 83rd element in the periodic table is Bismuth (Bi). It is a post-transition metal and has an atomic number of 83.