Atomic radii
Authored by Marwan mamdouh
Chemistry
11th - 12th Grade
NGSS covered
Used 211+ times
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About
This quiz focuses on atomic radii and periodic trends in chemistry, specifically examining how atomic size varies across periods and down groups in the periodic table. Designed for grades 11-12, the questions assess students' understanding of the fundamental relationships between atomic structure and periodic properties. Students must grasp core concepts including the definition of atomic radius as half the distance between nuclei of bonded atoms, the inverse relationship between atomic radius and nuclear charge across periods, and the direct relationship between atomic radius and energy levels down groups. The quiz also requires understanding of effective nuclear charge, electron shielding, and how these factors influence atomic size. Students need to apply their knowledge of electron configurations, identify valence versus core electrons, and predict relative atomic sizes based on periodic table positions. The problems demand both conceptual understanding and practical application skills, requiring students to order elements by size and explain the underlying atomic-level reasons for periodic trends. Created by Marwan Mamdouh, a Chemistry teacher in Egypt who teaches grades 11-12. This comprehensive assessment serves multiple instructional purposes, functioning effectively as a review activity before exams, formative assessment during periodic trends instruction, or homework to reinforce classroom learning. Teachers can use individual questions as warm-up problems to activate prior knowledge or deploy the entire quiz to evaluate student mastery of atomic structure concepts. The varied question formats - from definitional understanding to comparative analysis - make this quiz particularly valuable for identifying specific areas where students need additional support. The content aligns with chemistry standards NGSS HS-PS1-1 (atomic structure and periodic relationships) and supports Common Core mathematical practices through data analysis and pattern recognition. This quiz strengthens student understanding of fundamental chemistry concepts that serve as prerequisites for advanced topics including chemical bonding, molecular geometry, and reaction mechanisms.
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31 questions
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1.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Which atom has the largest atomic radius?
potassium
rubidium
francium
cesium
Tags
NGSS.HS-PS1-1
2.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
As you move down the periodic table atoms get bigger. This is because ____________.
Tags
NGSS.HS-PS1-1
3.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
As you move across the periodic table atoms tend to get smaller because, ______________.
Tags
NGSS.HS-PS1-1
NGSS.HS-PS1-2
4.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
The atom with the largest atomic radius in Group 18 is -
Tags
NGSS.HS-PS1-1
5.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Which statement correctly and completely identifies a trend?
Atomic radius decreases across a period and increases down a group.
Electronegativity decreases across a period and decreases down a group.
Ionization energy increases across a period and increases down a group.
Ionic radius increases across a period and increases down a group.
Tags
NGSS.HS-PS1-1
NGSS.HS-PS1-2
6.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Which periodic group has the smallest atomic radius?
Tags
NGSS.HS-PS1-1
7.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Atomic radius generally increases as we move __________.
Tags
NGSS.HS-PS1-1
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