an alkali metal
Zirconium is a natural chemical element, a transition metal, group 4 and period 5 in the periodic table of Mendeleev, atomic number 40, etc.
Helium is located on the group 18 and period 1 on the modern periodic table.
Any element in the group 6 and period 3 (IUPAC version of periodic table).
Mn, Manganese
Silver is the 47th element on the periodic table. It is located in period 5 and group 11 in the periodic table.
There is no such element on the Periodic Table
5
Dubnium is an artificial chemical element, metal, solid, radioactive, placed in period 7 and group 5 of the periodic table of Mendeleev.
Helium is the element that is placed in period 1 and group 18 of the periodic table. It is inert in nature and hence stable.
Lutetium is classified under Group 3, an element under Lanthanides.
In the periodic table, the Group 2, Period 4 element is calcium. Calcium is classified as a silvery-gray metal. Calcium is the most abundant of the metallic elements in the human body.
There is no element in period 3 group 6. The element at period 3, group 16 (called on very old periodic tables group VIA) is sulfur (S).
Zirconium is a natural chemical element, a transition metal, group 4 and period 5 in the periodic table of Mendeleev, atomic number 40, etc.
Period 2 of group 15
beryllium, Be
Group 4 elements on the periodic table contain no period 2 elements whatsoever.
Helium is located on the group 18 and period 1 on the modern periodic table.