Practice: 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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Ch.1 Matter and Measurements | 4hrs & 29mins | 0% complete | ||

Ch.2 Atoms and the Periodic Table | 5hrs & 9mins | 0% complete | ||

Ch.3 Ionic Compounds | 2hrs & 12mins | 0% complete | ||

Ch.4 Molecular Compounds | 2hrs & 18mins | 0% complete | ||

Ch.5 Classification & Balancing of Chemical Reactions | 3hrs & 14mins | 0% complete | ||

Ch.6 Chemical Reactions & Quantities | 2hrs & 36mins | 0% complete | ||

Ch.7 Energy, Rate and Equilibrium | 3hrs & 18mins | 0% complete | ||

Ch.8 Gases, Liquids and Solids | 3hrs & 32mins | 0% complete | ||

Ch.9 Solutions | 4hrs & 11mins | 0% complete | ||

Ch.10 Acids and Bases | 3hrs & 26mins | 0% complete | ||

Ch.11 Nuclear Chemistry | 56mins | 0% complete | ||

BONUS: Lab Techniques and Procedures | 1hr & 38mins | 0% complete | ||

BONUS: Mathematical Operations and Functions | 47mins | 0% complete |

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

Concept #1: The 3 **subatomic particles** share key differences and similarities in their masses and charges.

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

Concept #2: Mass and Relative Charge of Subatomic Particles

Example #1: Osmium, one of the densest elements on earth, has an actual mass of 190.23 grams. According to the table above, what is its value in terms of atomic mass units?

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

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

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Concept #1: Subatomic Particles (Simplified) Concept 1

Concept #2: Subatomic Particles (Simplified) Concept 2

Example #1: Subatomic Particles (Simplified) Example 1

Practice #1: Subatomic Particles (Simplified) Practice 1

Practice #2: Subatomic Particles (Simplified) Practice 2

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