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Proton's charge
positive
Proton's Location
Nucleus
Proton's mass
1 AMU
Electron's mass
< 1 AMU
Electron's Location
Electron Cloud
Electron's Charge
negative
Neutron's Charge
neutral
Neutron's Location
Nucleus
Neutron's Mass
1 AMU
What's the difference in the number of electrons in Selenium (Se) and Aluminum (Al)?
21
An element has 36 protons, 36 electrons, and a mass of 84. How many neutrons does it have?
48
The smallest particle of an element is called
Atom
How many protons, neutrons, and electrons are found in Halfnium (Hf) with a mass of 178? (do not total, list each one out)
72 protons, 106 neutrons, 72 electrons
If you know the atomic number, what other two things do you know?
number or protons and number of electrons
If you need to solve for how many neutrons, what do you do?
Mass-Atomic Number
If you want to know how many protons+neutrons an element has, you would look at what on the reference sheet?
Atomic Mass
