Atomic Structure Flashcards
Everything in the Universe, is made up of what?
Atoms
Protons are
Positive
Neutron is
Don’t have a charge
Electrons are
Negative
Electrons are normally found in the ……………………….. of an Atom.
Shell
Protons and Neutrons are normally found in the …………………………
Nucleus
What is the Radius of an Atom?
about 0.1 nm (1 × 10-10 m)
What is the of a Proton
1. Relative mass
2. Relative charge
- One
- Plus One
What is the of a Neutron
1. Relative mass
2. Relative charge
- One
- Zero
What is the of an Electron
1. Relative mass
2. Relative charge
- 0.0005
- -1
Which is the smallest subatomic particle in an atom?
Electrons
what does Relative mean?
In comparison to/ compared to
Where is most of the mass of an Atom concentrated?
In the nucleus
When Atoms Emit (release) Electromagnetic Radiation, what happens to the electron?
Moves to a lower energy level
Atomic Theory is
the idea everything is made up of tiny little partices
What can these tiny little particles be
- broken down any further
- they separated from each other by space
Who made the Atomic Theory?
Democritus
What did John Dalton describe atoms as
solid spheres
What did he say about different types of spheres?
different types of shpere make different elements
Who came up with the plum pudding model?
J.J Thompson
What did J.J Thompson do?
- series of experiments
- showed atoms couldn’t be solid shpere
What did J.J Thompson think instead?
they must contain negatively charged particles
What did J.J Thompson find with the evidence thing think atoms are
- general ball of positive charge
- discrete electrons stuck in
