Atomic Structure Flashcards
What is an atom?
An atom is the smallest particle of an element that still has its chemical properties.
What is a molecule?
Two or more atoms joined together you bonds
What is the relative mass of an electron?
0.0005
What is the relative mass of a proton or neutron?
1
What is an isotope?
An isotope of an element are atoms with the amount of protons and electrons but a different number of neutrons
What are ions?
Ions are charged particles they are formed when an atom gains or loses electrons
What was Daltons model?
All atoms of an element are identical. Different elements contain different types of atom he imagined them as tiny spheres
What was Thomson’s model?
He discovered the electron when experimenting with cathode rays. He suggested the explain pudding model a positive sphere with negative electrons scattered through it
What was Rutherford’s model?
He fired alpha particles at a thin gold sheet most went through some were slightly deflected and some came straight back the way they were fired. He realised there is a positive nucleus and suggested electrons orbited it
What was Bohr model?
Bohr realises the orbiting electrons would be attracted to the positive nucleus’s and would rapidly spiral inwards. He suggested that electrons stayed in fixed energy levels or shells around the nucleus
