Unit 1- Atoms Flashcards
0
Q
What are the relative charges of each sub-particle in an atom? (3)
A
Proton- positive (+1)
Neutron- neutral (0)
Electron- negative (-1)
1
Q
Where is the nucleus in an atom and what charge does it have?
A
In the middle of the atom and positive because of the protons.
2
Q
How do you find out the number of each sub-particle in an atom (from a periodic table)?
A
Protons- the bottom number (proton/atomic number)
Electrons- equal to the number of protons
Neutrons- the top number (mass number) minus the atomic/proton number
3
Q
If an electron is added/removed what does the atom become?
A
Charged therefore it becomes an ion.
4
Q
How many elements are there?
A
Around 100.
5
Q
How are elements determined as different?
A
Different numbers of protons.
