Question

question 17 (1 point)
what is true about the elements whose highest - energy electrons are in d orbitals?
they are very reactive with oxygen.
they have only one valence electron.
they are called transition metals.
they demonstrate only one ionic state.

Explanation:

• Option 1: Transition metals (elements with highest - energy electrons in \(d\) orbitals) are not all very reactive with oxygen. For example, gold (\(Au\)) is a transition metal and is relatively unreactive with oxygen.
• Option 2: Transition metals have more than one valence electron. For example, iron (\(Fe\)) has 2 or 3 valence electrons depending on the compound.
• Option 3: By definition, elements whose highest - energy electrons are in \(d\) orbitals are called transition metals.
• Option 4: Transition metals can have multiple ionic states. For example, copper (\(Cu\)) can have \(Cu^{+}\) and \(Cu^{2+}\) ionic states.

Answer:

They are called transition metals.