10/5/22 - Atoms Flashcards
1
Q
What did Rutherford find in his gold foil experiment?
A
That there was a tiny nucleus inside an atom
2
Q
What is an element’s mass number?
A
Protons + neutrons
3
Q
What is an element’s atomic number?
A
The number of protons
4
Q
What are isotopes?
A
Atoms with the same number of protons but different numbers of neutrons.
5
Q
How do you find the number of neutrons in an atom?
A
Mass number minus atomic number
6
Q
If carbon has a mass number of 12 and an atomic number of 6, how many protons, electrons, and neutrons does it have?
A
6 protons, 6 electrons, 6 neutrons.
7
Q
If an isotope of uranium has 92 protons and 143 neutrons, what is its mass number and atomic number?
A
Mass number 235, atomic number 92
8
Q
How much do a proton and neutron weigh?
A
Just over 1 amu
