Question

which of the following is the noble gas notation shorthand for the element vanadium? a) ar 4s23d3 b) kr 4s23d3 c) ar 4s24d3 d) kr 4s24d3

Explanation:

Noble - gas shorthand notation uses the symbol of the nearest noble - gas element with a lower atomic number to represent the inner - shell electrons. Argon (Ar) has an atomic number of 18 and krypton (Kr) has an atomic number of 36. The electron configuration starting with [Ar] represents the electron configuration of argon plus additional electrons, and [Kr] represents the electron configuration of krypton plus additional electrons. In noble - gas shorthand, we use the noble - gas symbol that comes just before the element in the periodic table for the inner - shell electrons. Since [Ar] is for elements with electrons starting to fill orbitals after argon and [Kr] is for elements after krypton, the correct noble - gas shorthand should start with the appropriate noble - gas symbol for the element's electron configuration. Options a) and c) start with [Ar] and options b) and d) start with [Kr]. The correct noble - gas shorthand for an element's outer - shell electrons should be consistent with the position of the element in the periodic table. Since the outer - shell electrons start filling after argon for the given configurations, [Ar] is the correct starting noble - gas symbol for the shorthand notation among the options.

Answer:

a) [Ar] 4s²3d³, c) [Ar] 4s²4d³