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Chapter 6: Q.86E. (page 338)

Explain why Al is a member of group 13 rather than group 3?

Short Answer

Expert verified

Aluminum falls in the p block, in which elements have 3 valence electrons in the p orbital and group 13 has a single electron in a subshell.

Step by step solution

01

Groups in the periodic table

The vertical columns in the periodic table are called groups.

An element is present in its respective group because of its two aspects, chemical properties, and valence electrons.

Elements with valence electrons 1, 2, 3, 4, 5, 6, 7, 8 are in group 1, 2, 13, 14, 15, 16. 17, 18 respectively. Properties vary as alkaline earth metals are placed in group 2. Similarly, elements in group 15 are pnictogens. Elements in group 16 are chalcogens. Elements in group 17 are halogens.

02

Aluminum is a member of group 13

Aluminum falls in the p block, in which elements have 3 valence electrons in the p orbital and group 13 has a single electron in their valence shell.These fulfill the criteria of the characteristics of aluminum.

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Most popular questions from this chapter

Based on their positions in the periodic table, list the following ions in order of increasing radius:\({{\bf{K}}^ + },{\rm{ }}{\bf{C}}{{\bf{a}}^{{\bf{2}} + }},{\rm{ }}{\bf{A}}{{\bf{l}}^{{\bf{3}} + }},{\rm{ }}{\bf{S}}{{\bf{i}}^{{\bf{4}} + }}.\)

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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.
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