Unit 1-(c) The Structure of the Atom-A. Sub-atomic particles Flashcards
0
Q
What three things does an atom contain and where do they stay?
A
protons and neutrons- nucleus
electrons-outside the nucleus in shells
1
Q
What are elements made up of?
A
atoms
2
Q
What are the charge and mass of a proton?
A
1 positive
1 atomic mass unit
3
Q
What are the charge and mass of a neutron
A
neutral
1 atomic mass unit
4
Q
What are the mass and charge of an electron?
A
1 negative
virtually no mass
5
Q
Why is an atom neutral?
A
The numbers of protons and electrons are equal.
