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Ch.8 - Periodic Properties of the Elements
Tro - Chemistry: A Molecular Approach 4th Edition
Tro4th EditionChemistry: A Molecular ApproachISBN: 9780134112831Non è quello che usi tu?Cambia libro di testo
Capitolo 8, Problema 76

Arrange these elements in order of decreasing first ionization energy: Cl, S, Sn, Pb.

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Understand that first ionization energy is the energy required to remove the outermost electron from a neutral atom in the gaseous state.
Recall that ionization energy generally increases across a period (from left to right) and decreases down a group (from top to bottom) in the periodic table.
Identify the positions of the given elements in the periodic table: Cl (Chlorine) and S (Sulfur) are in the same period, while Sn (Tin) and Pb (Lead) are in the same group.
Compare Cl and S: Since Cl is to the right of S in the same period, Cl has a higher first ionization energy than S.
Compare Sn and Pb: Since Sn is above Pb in the same group, Sn has a higher first ionization energy than Pb.

Concetti chiave

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Ionization Energy

Ionization energy is the energy required to remove an electron from an atom in its gaseous state. It is a key factor in determining an element's reactivity and is influenced by the atomic structure, including the number of protons and the distance of the outer electrons from the nucleus.
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Ionization Energy

Trends in the Periodic Table

Ionization energy generally increases across a period from left to right due to increasing nuclear charge, which holds electrons more tightly. Conversely, it decreases down a group as the outer electrons are farther from the nucleus and experience greater shielding from inner electrons, making them easier to remove.
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Periodic Trends

Comparison of Elements

When comparing elements like Cl, S, Sn, and Pb, it is essential to consider their positions in the periodic table. Chlorine (Cl) is a non-metal in period 3, sulfur (S) is also a non-metal in period 3, while tin (Sn) and lead (Pb) are metals in periods 5 and 6, respectively, which typically have lower ionization energies due to their larger atomic radii and increased electron shielding.
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Elemental Forms of Elements