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Chapter 6: Q76E. (page 337)

Based on their positions in the periodic table, list the following atoms in order of increasing radius: Sr, Ca, Si, Cl.

Short Answer

Expert verified

\(\;Cl{\rm{ }} < {\rm{ }}Si{\rm{ }} < {\rm{ }}Ca{\rm{ }} < {\rm{ }}Sr\)

Step by step solution

01

Atomic radius of the elements along the period from left to right in the periodic table

As the effective nuclear charge increases along the period from left to right in the periodic table, the atomic radius of the elements of the same period decreases.

02

Atomic radius of the elements along with the group from top to bottom in the periodic table

If the elements of the same (column) group are considered in the periodic table, the new shell will enter the atoms, increasing the atomic radius.

03

The order of radius in the given elements 

The element Sr belongs to the fifth period. So it has the largest size.

The element Ca belongs to the fourth period. So it has the second-largest size.

The elements Si and Cl belong to the third period. But from left to right along the period, atomic size decreases.

Thus, the order is:

\(\;Cl{\rm{ }} < {\rm{ }}Si{\rm{ }} < {\rm{ }}Ca{\rm{ }} < {\rm{ }}Sr\)

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Most popular questions from this chapter

The ionic radii of the ions \({{\bf{S}}^{{\bf{2}}-}},{\rm{ }}{\bf{C}}{{\bf{l}}^-},{\rm{ }}{\bf{and}}{\rm{ }}{{\bf{K}}^ + }\) are 184, 181, 138 pm respectively. Explain why these ions havedifferent sizes even though they contain the same number of electrons.

List the following ions in order of increasing radius: \({\bf{L}}{{\bf{i}}^ + },{\rm{ }}{\bf{M}}{{\bf{g}}^{{\bf{2}} + }},{\rm{ }}{\bf{B}}{{\bf{r}}^--},{\rm{ }}{\bf{T}}{{\bf{e}}^{{\bf{2}}--}}.\)

Which has the lowest value for IE1: O, Po, Pb, or Ba?

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Describe the properties of an electron associated with each of the following four quantum numbers:n,l,ml, andms.

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