Ch3 Flashcards
What is the smallest part of all matter?
atoms
Why haven’t scientists been able to study atoms directly?
atoms are too small to be seen and microscopes aren’t equipped enough to see them
What is the current model of an atom called?
Electron cloud model
What are the three basic parts of an atom?
Protons, neutrons, and electrons
What electrical charges do these parts have?
Protons are positive neutrons are neutral or have no charge and electrons are negative
Where are the basic parts found?
Protons and neutrons are found in the nucleus and electrons are found in the cloud moving around the nucleus
Where is the most mass of an atom found?
In the nucleus
What part of an atom takes up most of it space?
Electron cloud
What is matter?
Anything that has mass and takes up space
What is an atom?
A small particle that makes up most types of matter
What is the law of conservation of matter?
It means matter is neither created nor destroyed, but only changes form
What happened before Lavoisier?
People used to think matter could appear and disappear
What did Dalton introduce?
He introduced in early atomic Theory of matter
What are too small to be seen by the human eye?
atoms
What is each type of matter made up of?
One kind of atom
atoms are made of even smaller what?
sub-atomic particles
What are tiny negatively charged particles with mass?
Electrons
An atom is a ball of what?
It is a ball of positive charge with electrons embedded in it
Who suggested a new model of the atom?
Rutherford
What is the positively charged central part of the atom?
The nucleus
What are positively charged particles in the nucleus?
Protons
What are neutrons?
Particles that come from the nucleus and have no charge
what does the electron cloud model mean?
Electrons are so small and fast they move in a cloud
What is the matter?
Anything that has mass and takes up space
What is an atom?
A small particle that makes up most types of matter
Who was the first person to coin the term atom? (atomos)
Democritus
What did Democritus do?
He was the first person to coinn the word atom
What is the law of conservation of matter?
It means matter is neither created nor destroyed but only changes form
Who introduced the law of conservation of matter which means matter is neither created nor destroyed but only changes form?
Antoine Lavoisier
What did Antoine Lavoisier do?
He introduced the law of conservation of matter which means matter is neither created nor destroyed but only changes form
What did people think before Lavoisier?
They thought matter could appear and disappear
Who introduced and early atomic theory that atoms are too small to be seen by the human eye and each type of matter is made of only one kind of atom?
John Dalton
What did John Dalton do?
He introduced in early atomic theory that atoms are too small to be seen by the human night and each type of matter is made of only one kind of atom
Who discovered that atoms are made of even smaller sub atomic particles?
J.J. Thomson
What did J.J. Thomson do?
He discovered that Adams are made of even smaller subatomic particles
What are electrons?
Tiny negatively charged particles with mass
Who proposed that an atom was a ball of positive charge with electrons embedded in it?
J.J. Thomson
Who suggested a new model of the atom?
Earnest Rutherford
What did Earnest Rutherford do?
He proposed a new model of an atom
Who propose the nucleus is the positively charged central part of the Atom?
Rutherford
What are protons?
Positively charged particles in the nucleus
What are scattered in the mostly empty space around the nucleus?
Electrons
Who introduced neutrons, particles that come from the nucleus and have no charge; neutral?
James Chadwick
What did James Chadwick do?
Introduced neutrons, particles that come from the nucleus and have no charge; neutral
Who suggested that electrons move an energy levels?
Niels Bohr
What did Niels Bohr do?
He suggested that electrons move in energy levels which are
2-8-18-32
What are the energy levels?
2-8-18-32
Who coined the term atom?
Democritus
Made the law of conservation of matter
Antoine Lavoisier
Atomic theory
John Dalton
Electrons, atoms, a ball of positively charged particles with electrons imbedded into it
J.J. Thomson
Nucleus, protons
Earnest Rutherford
Neutrons
James Chadwick
Energy levels
2-8-18-32
Niels Bohr
Describe a neutron
It has no charge and it is located inside the nucleus
Describe a proton
It has a positive charge and it is located inside the nucleus
Describe an electron
It has negative charge and is located around the nucleus on energy levels
2-8-18-32
Describe a nucleus
It is in the center of an atomit has a positive charge and it has the greatest amount of mass
