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Chemistry 1210 Chapter 7 – Complete Study Guide, Key Concepts & Exam Review

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Comprehensive Chemistry 1210 Chapter 7 study material covering important chemistry concepts, definitions, formulas, calculations, reactions, and problem-solving techniques. Ideal for students preparing for Chemistry 1210 Chapter 7 exams, quizzes, assignments, assessments, and course revision.

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Chemistry 1210 Chapter 7
– Complete Study Guide,
Key Concepts & Exam
Review
| Guaranteed success|




Updated 2026 Questions and Answers

100% Verified Exam Prep and Comprehensive
Rationales
Included

, Main group 1A- 7A (s²p⁶)


transition metals 1B-8B (d¹⁰)


newlands octaves Mendeleev (1860s)




Moseley atomic number p, e⁻ (1913)


effective nuclear charge (Zeff) each electron is simultaneously attracted/ repelled, outer shell electrons
are screened from the nucleus by inner shell electrons


equation for effective nuclear charge Zeff= Z-S


trend of effective nuclear charge - increases from left to right
- increases from bottom to top


trend of radius - increases from top to bottom
-increases from right to left


is radius defined? yes


why does size increase down a group? same outer shell electron configuration and increase of "n" (orbital "size")


why does size decrease across a period from left to - Zeff increases
right? - inner e⁻ screen/shield outer e⁻ from full positive charge of the nucleus


ion size - cations= smaller
-anions= larger




isoelectronic ions O²⁻
F⁻
Ne
Na⁺
Mg²⁺
Al³⁺

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