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Chapter 6: Problem 59

List the following species in order of decreasing radius. (a) \(\mathrm{C}, \mathrm{Mg}, \mathrm{Ca}, \mathrm{Si}\) (b) Sr, Cl, Br, I

Short Answer

Expert verified
Question: Arrange the following elements in order of decreasing radius: (a) C, Mg, Ca, Si and (b) Sr, Cl, Br, I. Answer: (a) Ca > Mg > Si > C and (b) Sr > I > Br > Cl.

Step by step solution

01

Identify the positions in the periodic table

Place each element in its respective position in the periodic table. C is a group 14 element, Mg is a group 2 element, Ca is also a group 2 element, and Si is a group 14 element.
02

Apply the atomic radius trend

As you move from left to right across a period, atomic radius generally decreases due to the increasing effective nuclear charge. As you move down a group, atomic radius generally increases due to the addition of electron shells.
03

List the elements in order of decreasing radius

Knowing the trends in atomic radius, we can order the elements as follows: \(\mathrm{Ca} \gt \mathrm{Mg} \gt \mathrm{Si} \gt \mathrm{C}\). (b) Sr, Cl, Br, I
04

Identify the positions in the periodic table

Place each element in its respective position in the periodic table. Sr is a group 2 element, Cl is a group 17 element, Br is also a group 17 element, and I is a group 17 element.
05

Apply the atomic radius trend

Similar to the first part, as you move from left to right across a period, atomic radius generally decreases due to the increasing effective nuclear charge. As you move down a group, atomic radius generally increases due to the addition of electron shells.
06

List the elements in order of decreasing radius

Knowing the trends in atomic radius, we can order the elements as follows: Sr \(\gt\) I \(\gt\) Br \(\gt\) Cl.

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