Question

. An element has the following electronic configuration: [Ar]3d1 4s (a) What period does it belong to? (b) What is its group number? (Use group numbers from 1 to 18) (c) What kind of element is it? (Main group metal, transition metal, metalloid, nonmetal?) d) How many unpaired electrons are there in an atom of this element? 2. (a) What element has this electronic configuration? 1s 2s 2p'3s3p (b) What element has this electronic configuration? 3d 4s 4p 3. (a) Which of the following atoms or ions is diamagnetie? N°. Se Cl. N. V). (b) Which of the following atoms or ions is paramagnetie? CI ZnN TiBr

Answer 1

1. The element with the given electronic configuration is zinc. It is the last of the first-row transitions elements and is situated in the same period as potassium through krypton. In the periodic table, the elements occurring left to right on the same row are labelled to be in the same period and from period 1 having H and He, Zn is situated in Period 4. The element is the last of d-block elements and is succeeded gallium. It is a electropositive element like all d-block elements. In the periodic table all elements situated in a single column are said to be constituents of a single group. The alkali metals comprise of group 1, alkaline earth metals group 2 and d-block elements from group 3 through 12. Zinc, being the last of the first-row d-block elements is in Group 12. Being electropositive in nature owing to the tendency to attain a noble gas configuration by losing its two 4s-orbital electrons, zinc is a metal. Since both the d and s-orbitals of its valence shell are completely filled with d-orbital accommodating all 10 electrons it can and s-orbital accommodating all two, the element has zero unpaired electrons.

2. a) The element with the given electronic configuration has 16 electrons, implying its atomic number is 16. That corresponds to the element sulfur.

b) The given outer electron configuration of the element corresponds to a d-block element in the period 4, also known as first-row transition metals. These start from scandium with a configuration of [Ar]3d¹4s², end with Zinc whose configuration is [Ar]3d¹⁰4s², going from Scadium, Titanium, Vanadium, etc. Following Aufbau's principle and Hund's rule for highest spin multiplicity, the given electronic configuration corresponds to Vanadium.