Atomic Theory 1
Atoms that have a net positive or negative charge.
What are ions?
Electrons have a _______ charge.
Negative
What subatomic particle was discovered by Rutherford?
Proton
The number of electrons the first energy level can hold.
What is up to 2 electrons?
Protons have this type of charge.
What is positive?
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
This scientist is credited for the discovery of the neutron.
Who is Chadwick?
Substances made of particles that have mass and volume.
What is matter?
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?
Atoms are arranged in these ways.
What are crystals and molecules?
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
The nucleus, electron cloud and empty space represent this.
What is the atom?
What particles make up the nucleus?
Protons and neutrons
These basic things formed the universe.
What is matter, intelligence, and energy?
The model accepted today to represent the atom.
What is the Quantum model?
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?
There are many characteristics of electrons.
What is they act like tiny particles and waves, are negatively charged, hard to find, has specific amount of energy, they buzz around in the electron cloud, and electrons are arranged based on their energy?