Atomic number and mass number Flashcards
1
Q
Where is most of the mass in an atom
A
in the nucleus
2
Q
State the meaning of atomic number.
A
The number of protons it has
3
Q
State the meaning of mass number.
A
The number of protons + the number of neutrons
4
Q
Describe how the atoms of different elements vary.
A
The number of protons/the atomic number varies in every elements’ atom
5
Q
State the number of electrons in an atom from its atomic number.
A
That number (there are the same amount of protons as neutrons.
6
Q
Calculate the numbers of protons, neutrons and electrons using atomic and mass numbers
A
What you will have to do is take the atomic number (this is both the electron and proton) and take it away from the mass, which will give you the neutrons
