Atomic Theory 1
Atoms that have a net positive or negative charge.
What are ions?
Electrons have a __ charge and neutrons have ___ charge.
What is negative & no?
Located in the nucleus, this subatomic particle has a positive charge and determines an element's identity.
What is a proton?
Atoms of the same element that have the same number of protons but different numbers of neutrons are called this.
What are isotopes?
Protons have this type of charge.
What is positive?
This subatomic particle has a relative mass of almost zero (1/2000th of a proton) and orbits the nucleus.
What is an electron?
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 and came up with the first atomic theory?
Dalton
This scientist is credited for the discovery of the neutron.
Who is Chadwick?
This things is defined by having mass and volume.
What is matter?
The atomic number of an atom is equal to the number of these particles in its nucleus.
What are protons?
Thomson
Which scientist first determined that electrons are found outside of the nucleus?
Rutherford
This scientist came up with the first atomic theory of the atom.
Who is Dalton?
Ernest Rutherford concluded that the atom is mostly empty space with a dense, positively charged center following this famous 1909 experiment.
What is the Gold Foil Experiment?
What particles make up the nucleus?
Protons and Neutrons
Where is most of the atom's mass located?
Nucleus
In Bohr's model, orbits are called _______.
What is electron clouds or 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
The nucleus, electron cloud and empty space represent this.
What is the atom?
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
James Chadwick was the last to complete the classical atomic model in 1932 by discovering this neutral subatomic particle in the nucleus.
What is the neutron?
The model accepted today to represent the atom.
What is the Quantum model?
Name 3 things you remember from Chapter 1.
What is...?
The number of sig figs in this number 0.000470900.
What is 6?