Atomic number and mass number Flashcards
1
Q
relative charge of proton,neutron,electron
A
proton +1
electron -1
neutron 0
2
Q
Relative mass of proton,neutron,electron
A
Proton 1
Neutron 1
Electron 0.0005
2
Q
why do atoms contain equal numbers of protons and electrons
A
the positive and negative charges “cancel out”, making atoms electrically neutral.
2
Q
What is mass number of an atom?
A
the total number of protons and neutrons in an atom.
