Atomic Theory 1
Dalton's atomic theory stated that atoms of different elements combined to form ________.
Compounds
Electrons have a _______ charge.
Negative
What subatomic particle was discovered by Rutherford?
Proton
This scientist arranged the periodic table by atomic mass.
Who is Mendeelev?
This type of nuclear reaction combines nuclei of lighter elements
Fusion
A sphere can be used to represent his atomic theory
Dalton
Dalton stated that atoms of different elements have _________ properties.
Different
Who stated that atoms can't be created, divided, or destroyed?
Dalton
This scientist is credited for the Nuclear Model of the atom.
Who is Rutherford?
A neutron splits into these two particles
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?
Most dangerous type of radiation to human tissue
Gamma radiation
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
In Bohr's model, orbits are called _______.
Energy levels
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 charge on an alpha particle?
+2
What particles make up the nucleus?
Protons and neutrons
What is an isotope?
atomic number is the same, atomic mass is different
Who discovered the planetary model of the atom?
Bohr
This scientists believed that electrons orbited the nucleus like planets orbit the sun in certain energy levels. He also came up with the Planetary Model of the atom.
Who is Neils Bohr?
What did Rutherford use to bombard the gold foil in his experiment?
Helium atoms, or alpha particles.