Question

Identify each of the following as a representative element or a transition element:

A) Lithium
B) Platinum
C) Promethium
D) Carbon

Answer 1

Lithium and carbon are representative elements, while platinum is a transition element. Promethium is classified as an inner transition metal.

Step-by-step explanation:

Elements can be classified as either representative elements, transition elements, or inner transition elements based on their placement in the periodic table and their electron configurations. Here's the classification of the given elements:

Lithium (Li) is an alkali metal found in Group 1 of the periodic table, making it a representative element.

Platinum (Pt) is located in Group 10, within the block of transition metals, thus it is a transition element.

Promethium (Pm) is part of the lanthanide series, which are inner transition metals specifically located in the f-block of the periodic table.

Carbon (C) is a non-metal found in Group 14, making it a representative element.

Answer 2

The correct answer is B. Platinum is the transition element among the choices. The elements belonging to this group are those having a partially filled d or f subshell. It usually refers to the d-block transition elements of the periodic table.