Atomic structure Exam questions Flashcards
1
Q
Which of these atoms has the largest atomic radius? A Ar B Cl C Mg D Na
A
D Na
As going across period, atomic radii decreases due to increased nuclear charge - which attracts the electron shells closer to the nuclei.
2
Q
Which one of the following is a correct electron arrangement? A Cu+ is [Ar]3d94s1 B Cu is [Ar]3d104s2 C Cu2+ is [Ar]3d84s1 D Cu+ is [Ar]3d10
A
D
As firstly, Cu is a transition metal hence last orbital is in the d-block. Next, Ar has 18 electrons, cu has 29. So 11 left. As cu + it has 10. A d orbital can hold 10 electrons so it is not A. it is D.
