What is an Atom?
How many atoms are there in the universe?
10 followed by 80 zeroes
What is everything made of?
Atoms
What is the center of an atom called?
Nucleus
What are the three subatomic particles atoms are made of?
Protons, Neutrons, Electrons
Neutrons
Subatomic particles with 0 or no charge
Electron clouds are the?
Visual model for the most likely locations of electrons in an atom
Electrons Clouds look like?
a cloud around the nucleus
Substance
anything that always has the same combination of atoms/elements
What are atoms mostly made of?
empty space
Protons and Neutrons have almost _________
equal masses
How do electrons move?
in constant random motion
What kind of charge does a nucleus have?
positive
Protons
positively charged subatomic particles
What is a nucleus composed of?
protons and neutrons
Element
substance made up of only one type of atom
Atom
the smallest unit/piece of an element
What happens when you split certain atoms
they will explode (atomic bomb)
How small are atoms?
extremely small
Electrons have much _____
less mass than protons and neutrons
Electrons
negatively charged subatomic particles
Why does a nucleus have a positive charge?
neutrons have 0 or no charge, protons have a positive charge
What holds the nucleus together?
nuclear force
