Atomic Theory 1
Atoms that have a net positive or negative charge.
What are ions?
Electrons have a _______ charge.
Negative
What was discovered by Rutherford?
Substances made of particles that have mass and volume.
What is matter?
What is 22?
An atom has an equal number of protons and electrons.
What is electrically neutral?
This Greek philosopher was the first to imagine everything is made of tiny, indivisible particles.
Who is Democritus?
Who stated that atoms can't be created, divided, or destroyed?
Dalton
The scientists who came up with the "Plum-Pudding" model.
Who is Thompson?
What is the average atomic mass of Bromine?
79.904
(can vary slightly depending on periodic table used)
Thomson was the first person to discover...
Atoms have electrons
Thomson
Which scientist first determined that electrons are found outside of the nucleus?
Rutherford
Who is Dalton?
What is average atomic mass?
Weighted average of all naturally occurring isotopes
Why did the positively charged alpha particles bounce back in Rutherford's Gold Foil Experiment?
They collided and were repelled by the positively charged nucleus
Where is most of the atom's mass located?
Nucleus
The Cathode Ray Tube experiment led to the discovery of the ________.
This scientist is credited for the discovery of the neutron.
Who is Chadwick?
What is the number of protons, neutrons and electrons in Tin-120?
Protons=50
Neutrons=70
Electrons=50
What particles make up the nucleus?
Protons and neutrons
These basic make up all matter.
What are atoms?
Where are protons, neutrons and electrons located?
Where is the nucleus, nucleus, and electron cloud?
There were two major findings of Rutherford's Gold Foil Experiment. Name one.
The atom is mostly empty space
OR
There is a positively charged nucleus
What is the AAM and element name with the following mass and abundance:
Element- 40 (96.94%)
Element- 41 (3.06%)
40.0306 amu, Calcium