GOB Chemistry

Learn the toughest concepts covered in your GOB - General, Organic, and Biological Chemistry class with step-by-step video tutorials and practice problems.

Atoms and the Periodic Table

Subatomic Particles (Simplified)

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The atom is composed of 3 subatomic particles:neutrons, protons, and electrons.

The Atom & Subatomic Particles

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concept

Subatomic Particles (Simplified) Concept 1

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In terms of size, neutrons are the largest, protons are slightly smaller, and the electrons are the smallest.

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Subatomic Particles (Simplified) Concept 2

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Subatomic Particles (Simplified) Example 1

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Problem

According to the table above, how many electrons are needed to have a combined mass of 1.0465 x 10-25 kg?

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Problem

How many atoms are contained in 0.230 g of sodium, Na? The mass of one sodium atom is 23.99 amu.