Question

given the following configuration, what element is indicated; ar 4s², 3d⁷ * 1 po cobalt rhodium iron nickel

Explanation:

• Argon (\([Ar]\)) has 18 electrons.
• The \(4s^{2}\) sub - shell has 2 electrons.
• The \(3d^{7}\) sub - shell has 7 electrons.
• Total number of electrons \(=18 + 2+7=27\).
• The atomic number of an element is equal to the number of electrons in a neutral atom.
• Cobalt (\(Co\)) has an atomic number of 27.

Answer:

Cobalt