GCSE physics
What does relative mean?
Compared e.g. an elephant is tall relative to a goat
Are protons positive neutral or negative
Positive
Are neutrons, neutral positive or negative
Neutral
Are electrons negative positive or neutral
Negative
How many electrons are allowed in the first shell?
2
How many electrons are allowed in the 2nd to the outer shells?
8
What is the relative mass of a proton?
One
What is the relative charge of a proton?
+1
What is the relative mass of a neutron?
One
What is the relative charge of a neutron?
Zero
What is the relative mass of an electron?
Zero
What is the relative charge of an electron?
Minus one
Name the equation for the number of neutrons
Number of neutrons equals mass number minus atomic number
what do you do to make an ion?
Add or take away electrons
If electrons are added, is the ion negative or positive
Negative
if electrons are removed, is the ion positive or negative
Positive
what is an Isotope
An atom that has a bigger atomic mass number than usual, but the proton number is the same
If you place north pole magnet, nearest south pole magnet What will happen?
They will attract
what do Dalton think about the atom?
It was a solid sphere
What changed Dalton's model
The discovery of the electron
Who made the plum pudding model
Thompson
Who discover the nucleus and was it an accident?
Rutherford it was an accident
Who discovered the bohr model of an atom
Niels Bohr