science flascards

Question	Answer
What is an atom?	a building block of everything.
what is an atomic number?	its the number of protons in a nucleus.
what's the 3 particles that make up atoms?	protons neutrons electrons
how many atoms are on the periodic table?	118
what are clusters of atoms known as?	molecules
how many electrons are in each shell?	1-2 2-8 3-18
what is a compound?	a pure substance that is made up of 2 or more different types of atom chemically joined.
what is a element?	a substance made up of only one type of atom.
what did NielsBohr propose?	he proposed that electrons can only travel along certain pathways around the nucleus.
what did Ernest Rutherford discover?	he discovered that the nucleus only takes up a small fraction of the space inside an atom.

Resource summary

	Created by Ali Aldhalimi about 8 years ago