Fluorine.
No element in period 3 has an atomic mass of 12.
On the Periodic Table, a Period is one of the horizontal rows. If an element is last in it's period, then it's on the right hand side of the Periodic Table. There is an inert gas at the end of every Period.
Krypton is the 36 th element in the periodic table. It is a noble gas belonging to 4th period of the periodic table.
The last element in each period is a noble element. It is non-reactive.
Neon element in the periodic table period 2 has most mass.It has atomic mass of 20.17.It is colorless and odorless.
No element in period 3 has an atomic mass of 12.
Bromine. :)
The element Mg is in the 3rd period of the periodic table.
Ar(argon)
On the Periodic Table, a Period is one of the horizontal rows. If an element is last in it's period, then it's on the right hand side of the Periodic Table. There is an inert gas at the end of every Period.
There is no such element on the Periodic Table
An elements period is its row in the Periodic Table.
An elements period is its row in the Periodic Table.
Caesium is a Period 6 element.
In the fourth period of the periodic table of elements, the most reactive element is potassium. It is an alkali metal, and it has the atomic number of 19.
The first element in the fourth period of the Periodic Table is potassium (K).
Krypton is the 36 th element in the periodic table. It is a noble gas belonging to 4th period of the periodic table.