Argon has completely filled M shell (or 3p orbital)
p-block elements have partially filled p-subshell. It is not completely filled.
4f
The period number on the periodic table tells you which energy level (shell) of an atom is being filled. The subshell within that energy level is determined by the block in which the element is located on the periodic table. For example, elements in the s-block fill the s subshell, elements in the p-block fill the p subshell, and so on.
The element with atomic number 47 is silver (Ag). In its neutral state, the electron configuration of silver is [Kr] 4d^10 5s^1. This means the 4d subshell is being filled by the electrons of silver.
Argon is a noble gas and being as its highest energy level is completely filled there are no electrons available for bonding in argon.
Argon, being one of the noble gases, has a completely filled outer electron shell and thus has zero valency.
Argon gas is typically filled in light bulbs to prevent oxidation of the filament and extend the bulb's life. It is also used in double-pane windows to improve insulation by reducing heat transfer. Additionally, argon is commonly used in welding to displace air and prevent oxidation of the metal being welded.
The 4f subshell is being filled in the lanthanide series of the periodic table, which are also known as the "rare earth elements." They are located in the f-block of the periodic table, filling the 4f subshell from atomic number 58 (Cerium) to 71 (Lutetium).
Exceptions to the general trend of increasing ionization energy across a period in the periodic table occur when there is a half-filled or fully-filled subshell, which results in increased stability and lower ionization energy. This is known as the "half-filled and fully-filled subshell stability" rule.
The element with the lowest atomic number that contains a half-filled d subshell at its ground state is scandium (atomic number 21). The electron configuration of scandium at ground state is [Ar] 3d^1 4s^2, where the 3d subshell is half-filled with one electron.
The actinides family corresponds to the 5f subshell. This subshell can hold a maximum of 14 electrons and is located in the seventh period of the periodic table. The actinides are a series of elements with atomic numbers 89 to 103.
The compound with the 2+ ion that is the smallest with a filled d subshell is zinc (Zn^2+), and the anion that forms from the smallest halogen is fluoride (F^-). Therefore, the compound you are looking for is zinc fluoride (ZnF2).