Question

elements that are characterized by the filling of p orbitals are classified as ____. groups 3a through 8a inner transition metals transition metals groups 1a and 2a

Explanation:

• Groups 3A through 8A: In the periodic table, the \(p -\)block elements are those in which the last electron enters a \(p -\)orbital. The \(p -\)block consists of groups \(13 - 18\) (or \(3A - 8A\) in the older group - naming system). For example, boron (\(B\)) in group \(3A\) has an electron configuration of \([He]2s^{2}2p^{1}\), and the last - filled orbital is a \(p -\)orbital.
• Inner transition metals: These are the \(f -\)block elements (lanthanides and actinides). Their distinguishing feature is the filling of \(f -\)orbitals. For instance, cerium (\(Ce\)) has an electron configuration of \([Xe]4f^{1}5d^{1}6s^{2}\), and the key orbital for classification is the \(f -\)orbital.
• Transition metals: These are the \(d -\)block elements. The characteristic electron - filling is in \(d -\)orbitals. For example, iron (\(Fe\)) has an electron configuration of \([Ar]3d^{6}4s^{2}\), and the \(d -\)orbital filling is what classifies it as a transition metal.
• Groups 1A and 2A: These are the \(s -\)block elements. In group \(1A\) (e.g., sodium, \(Na\): \([Ne]3s^{1}\)) and group \(2A\) (e.g., magnesium, \(Mg\): \([Ne]3s^{2}\)), the last - filled orbital is an \(s -\)orbital.

Answer:

groups 3A through 8A