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
