103 free flashcards covering all 5 units. Study key concepts, terms, and exam-relevant topics.
A researcher observes that electrons in an atom occupy specific energy levels. What principle applies?
Aufbau principle
The Aufbau principle explains how electrons fill energy levels in an atom
The {{blank}} principle states that electrons fill the lowest available energy levels first
Aufbau
The Aufbau principle is a fundamental concept in chemistry
Aufbau principle vs. Pauli Exclusion principle: what's the key difference?
Aufbau: energy levels, Pauli: electron spin
The Aufbau principle and Pauli Exclusion principle are two distinct concepts in chemistry
What is the correct sequence of events when electrons fill energy levels in an atom?
1) Lowest energy level, 2) Higher energy levels
The Aufbau principle states that electrons fill the lowest available energy levels first
Describe the energy level diagram of an atom
Energy levels: 1s, 2s, 2p, etc.
The energy level diagram shows the arrangement of electrons in an atom
What's a common mistake when applying the Aufbau principle on the exam?
Forgetting to fill lowest energy levels first
The Aufbau principle states that electrons fill the lowest available energy levels first
A researcher observes that the atomic radius of elements decreases from left to right across a period. What principle applies and why?
Increasing effective nuclear charge
The researcher's observation is based on the principle that as you move from left to right across a period, the effective nuclear charge increases, resulting in a decrease in atomic radius.
The atomic radius of elements decreases from left to right across a period due to increasing {{blank}}
effective nuclear charge
The correct answer is based on the principle that as you move from left to right across a period, the effective nuclear charge increases, resulting in a decrease in atomic radius.
Compare and contrast the periodic trends of atomic radius across a period and down a group
Across a period: decreases, down a group: increases
The correct answer is based on the principle that as you move from left to right across a period, the effective nuclear charge increases, resulting in a decrease in atomic radius, while as you move down a group, the number of energy levels increases, resulting in an increase in atomic radius.
What is the correct sequence of events that explains the periodic trend of atomic radius across a period?
Increasing effective nuclear charge, decreasing atomic radius
The correct answer is based on the principle that as you move from left to right across a period, the effective nuclear charge increases, resulting in a decrease in atomic radius.
Describe the relationship between atomic radius and effective nuclear charge across a period
As effective nuclear charge increases, atomic radius decreases
The correct answer is based on the principle that as you move from left to right across a period, the effective nuclear charge increases, resulting in a decrease in atomic radius.
What is a common mistake students make when describing the periodic trend of atomic radius across a period?
Forgetting to consider effective nuclear charge
The correct answer is based on the principle that as you move from left to right across a period, the effective nuclear charge increases, resulting in a decrease in atomic radius.
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