Silicon
Beryllium (Be) - 9.012
Gold (AU) is an alkaline earth metal with a relative Atomic Mass of 196.97, an atomic number of 79 in group class 1B
Zink is a metal element. Atomic mass of it is 65.39.
Helium with an atomic mass of 4.00260
Cerium is a metal element. Atomic mass of it is 140.
In a given period, the element with lowest atomic mass will belong to group 1. It should also be noted that lithium is the metal with the smallest atomic mass.
Yttrium is the largest metal in group three. It is atomic number 39 and has an atomic mass of about 88.9.
Beryllium (Be) - 9.012
Gold (AU) is an alkaline earth metal with a relative Atomic Mass of 196.97, an atomic number of 79 in group class 1B
Zink is a metal element. Atomic mass of it is 65.39.
Rhodium is a transition metal, atomic # 45, Period 5, Group 9 on the periodic table, has an atomic mass of 102.9, and is solid at room temperature.
Helium with an atomic mass of 4.00260
Cerium is a metal element. Atomic mass of it is 140.
Calcium is a metal element. Atomic mass of it is 40.
Bromine, because Bromine has an atomic mass of only 5.
Fluorine is a metal element. Atomic Mass of it is 19.
Hydrogen