Atoms Flashcards
1
Q
What is atom’s small central nucleus made up of?
A
Protons and Neutrons
2
Q
What is the nucleus surrounded by?
A
Electrons, which are arranged in shells (energy levels).
3
Q
Atoms have the same number of protons as what?
A
Electrons, so the atom as a whole is neutral
4
Q
What does it mean it the atom is neutral?
A
It has no electrical charge
5
Q
Protons has the same mass as what?
A
Neutrons. The mass of an electron is negligible (nearly zero)
6
Q
What do all atoms of the same elements have?
A
The same number of protons
