C1 - Atomic Structure Flashcards
1
Q
What is an atom?
A
smallest part of an element that can exist
2
Q
What is Dalton’s model of an atom?
A
atoms as solid spheres that could not be divided into smaller parts
3
Q
What is the plum pudding model?
A
sphere of positive charge with negative electrons embedded in it
4
Q
What did scientists discover in the alpha scattering experiment?
A
some alpha particles were deflected by the gold foil - this showed that an atom’s mass and positive charge must be concentrated in one small place
5
Q
Describe nuclear model of atom
A
dense nucleus with electrons orbiting it
6
Q
What did Niels Bohr dicover?
A
electrons orbit nucleus in fixed energy levels/shells
7
Q
What did James Chadwick discover?
A
uncharged particle called the neutron
8
Q
What is an element?
A
substance made of one type of atom
