Question

type the symbol of each element that is described below: the lightest transition metal the heaviest alkali metal the third halogen element the fourth noble gas element

Explanation:

1. The lightest transition metal is Scandium (Sc) as it has the lowest atomic number among transition - metals.
2. The heaviest alkali metal is Francium (Fr) as it is at the bottom of Group 1 in the periodic table and has the highest atomic number among alkali metals.
3. The halogens are Fluorine (F), Chlorine (Cl), Bromine (Br), Iodine (I), and Astatine (At). So the third halogen is Bromine (Br).
4. The noble gases are Helium (He), Neon (Ne), Argon (Ar), Krypton (Kr), Xenon (Xe), and Radon (Rn). So the fourth noble gas is Krypton (Kr).

Answer:

The lightest Transition Metal: Sc
The heaviest Alkali Metal: Fr
The third Halogen element: Br
The fourth Noble Gas element: Kr