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