The 5 in 3d5 refers to the number of sides on the dice that is being rolled. In this case, it means rolling a 5-sided dice three times. The outcome will be a number between 3 and 15.
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The noble gas configuration of chromium (Cr) is [Ar] 3d5 4s1, which means it has the same electron configuration as argon (symbol Ar) with additional electrons in the 3d and 4s subshells.
The corresponding atom is chromium and its electron configuration is 1s2 2s2 2p6 3s2 3p6 4s1 3d5 or [Ar] 4s1 3d5 in shortened notation.
The shorthand electron configuration of manganese is [Ar]4s^2 3d^5. This notation indicates that manganese has 25 electrons, with the last two in the 4s orbital and the remaining five in the 3d orbital.
The noble gas for manganese is krypton.
The noble gas configuration for manganese (Mn) is [Ar] 3d5 4s2. This means that it has the same electron configuration as argon (Ar) with 18 electrons, followed by 3d5 and 4s2 orbitals filled with electrons.