Answer :
Answer:
a) Cl-
b) Al
c) Indium
Explanations
The atomic size of an elements depends on the energy level of the outermost electron and nuclear charge of the nucleus.
Also, you must understand that the atomic radius increases from top to bottom down the group and the decreases from left to right across the period.
a) For the element Cl and Cl-, the
The electronic configuration of Chlorine atom is given as:
[tex]Cl:1s^22s^22p^63s^23p^5[/tex]The electronic configuration of Chlorine ion Cl- will be
[tex]Cl^-:1s^22s^22p^63s^23p^6[/tex]Since the outermost electrons are already on the third energy level, we can determine which has larger radius by determining the electrons that will be attracted by the nucleus. Due to this, the chlorine ion (Cl-) will have a larger radius.
b) For Aluminum and Oxygen, since aluminum has a high energy level than oxygen and below the oxygen in the periodic table, hence Aluminum will have larger radius
c) ) For Indium and iodine, since Indium has a high energy level than Iodine and below the Iodine in the periodic table, hence Indium will have larger radius
