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