[Ar]3d54s1
[Ar]3d54s1
Gold is more stable.
hydried is more stable than H-atom
Corroded metal is not stable.
In the case of chromium (Cr), the electron configuration of 3d54s1 is more stable than 3d44s2. A half-filled sublevel is more stable than a sublevel that is less than half full. In the case of copper (Cu), the electron configuration of 3d104s1 is more stable than 3d94s2, again because a full sublevel and a half-filled sublevel is more stable.
[Ar]3d54s1
[Ar]3d54s1
[Ar]3d54s1
Perhaps the electronic configuration of Chromium? Ar for argon, argon has 18 electrons. Electronic configuration of argon can be written as 1s22s22p63s23p6. Electronic configuration of chromium is 1s22s22p63s23p63d54s1. As you can see you can just replace that long chain of figures in front of 3d54s1 with just Ar. Hence, [Ar]3d54s1.
More stable
Silicon is more stable.
Gold is more stable.
hydried is more stable than H-atom
A t least as stable as, say, the USA or Canada, if not more stable. More stable than Iran, Iraq, Pakistan, Afghanistan, Congo. But not as stable as Saudi Arabia, UAE, Oman, Qatar.
Oxygen becomes more stable when it forms compounds.
Yes it tends to be more stable.