an alkali metal
The element in period 4, group 7 of the periodic table is Manganese (Mn).
Astatine is a halogen; position in the periodic table of Mendeleev: group 17, period 6.
Lithium is in the first period of the periodic table. It is the first element in the alkali metal group.
Zirconium is a natural chemical element, a transition metal, group 4 and period 5 in the periodic table of Mendeleev, atomic number 40, etc.
The element in group V of the periodic table with 3 electron shells is Phosphorus (P). Group V elements have 5 valence electrons and the number of electron shells corresponds to the period number on the periodic table, so a Group V element with 3 electron shells is in period 3.
The element in period 4, group 7 of the periodic table is Manganese (Mn).
5
halogenhalogen in group VII
Dubnium is an artificial chemical element, metal, solid, radioactive, placed in period 7 and group 5 of the periodic table of Mendeleev.
iron is a metalyeah
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.
Astatine is a halogen; position in the periodic table of Mendeleev: group 17, period 6.
Silicon is a chemical element that belongs to Group 14 and Period 3 of the periodic table.
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).
Lutetium is classified under Group 3, an element under Lanthanides.
Lithium is in the first period of the periodic table. It is the first element in the alkali metal group.
Zirconium is a natural chemical element, a transition metal, group 4 and period 5 in the periodic table of Mendeleev, atomic number 40, etc.