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100
What is a proton?
Positive charged in nuleus
100
What is a neutron?
Neutrons are located in the nucleus and has no charge.
100
What is an electron?
It is outside of the nucleus and has a negative charge.
100
What is the letter or pair of letters that represent an abbreviated way to write an element?
Atomic Symbol
100
What is the center of an atom called?
The nucleus
200
What is an isotope?
It is when the number of protons do not match the number of neutrons
200
What is the weighted average of the masses of all the naturally occuring isotopes of an element?
Atomic Mass
200
What is the total number of protons and neutrons in an atom's nucelus?
Mass Number
200
Helium- Atomic number 2 Mass number 4 How many neutrons are in this atom?
2
200
Iron- Atomic number 26 Mass number 56 How m any protons are in an atom of iron?
26
300
The atomic number of an atom is equal to the number of what?
protons
300
What is an atom?
The smallest possible unit into which matter can be divded, while still maintaining its properties.
300
What is the Bohr Model proposed by Niels Bohr?
It suggested that electrons travel around the nucleus of an atom in orbits.
300
What did Schrodinger propose the idea of?
The electron cloud, which means where the electrons are found.
300
What is the symbol for the element magnesium?
Mg
400
What is the Atomic Theory of Matter?
That all substances are made of atoms; atoms are small particles that cannot be created, divided or destroyed.
400
What is the Law of Conservation of Mass or Matter?
It states that when a chemical reaction takes place, matter is neither created or destroyed.
400
What did J.J. Thomson discover?
Electrons
400
What was Antoine Lavoisier known as?
The "Father of Modern Chemistry."
400
What did Antoine Lavoisier discover?
The Law of Conversation of Mass or matter.
500
Why was Democritus important?
He was the first person to come up with the idea of an atom.
500
What did John Dalton state?
He proposed the Atomic Theory of Matter.
500
What did J.J. Thomson suggest?
That atoms actually contain smaller particles of matter.
500
What did Rutherford picture atoms being made up of?
That most of the atoms are made up of empty space.
500
What does atomos mean, per Democritus?
uncuttable or cannot be divided.