chlorine, 17, 17 in order you asked.
That element would be carbon.
Element Name: Arsenic. Chemical Symbol: As.
group name is noble gases. group number is 18.
iron
There is no element that has been found yet with those characteristics ( group 5, period 2)
there is no element found in such a place because that spot doesn't exist. there is a period 4-7 but not 1-3 for group 6. that particular spot is open and doesn't include any elements
The element in the same group as lithium (Group 1) and the same period as iron (Period 4) is potassium.
Platinum
Group: Group 3 element (actinide) Atomic Number: 98
Group 7 of the periodic table of Mendeleev and period 7 (transfermium elements).
There are only 7 groups. There are no more.
elements in group 2B of the periodic table with its atomic number 30 Zinc 48 Cadmium 80 Mercury 112 Ununbium (the discoverers of this have suggested the name copernicium) These elements are also known as transition elements and they belong to d-block.