Learning Path
Question & Answer
Choose the Best Answer
Helium - because it is non-reactive and has a full valence shell
Oxygen - because it is essential for respiration
Sodium - because it is highly reactive with water
Iron - because it is a transition metal and has variable oxidation states
Understanding the Answer
Let's break down why this is correct
Helium is a noble gas because it has a full outer shell of electrons, which makes it very stable and non-reactive. Other options are incorrect because Many students think oxygen is a noble gas because it is essential for breathing, but oxygen is actually highly reactive; Many students think sodium is a noble gas because it reacts quickly with water, but that reaction shows its high reactivity, not stability.
Key Concepts
Periodic Table Structure
easy level question
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Deep Dive: Periodic Table Structure
Master the fundamentals
Definition
The structure of the Periodic Table organizes elements based on their properties in a tabular form. It includes periods, groups, noble gases, and the arrangement of elements according to their atomic numbers. Understanding the structure helps in predicting the behavior and characteristics of elements.
Topic Definition
The structure of the Periodic Table organizes elements based on their properties in a tabular form. It includes periods, groups, noble gases, and the arrangement of elements according to their atomic numbers. Understanding the structure helps in predicting the behavior and characteristics of elements.
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