5th - Science Unit 1 Lesson 1 Flashcards
What is one important property of an element at room temperature?
State of matter
What is a substance that cannot be broken down into simpler substances?
Element
Another important property of an element is the way that it does what with other elements?
Reacts
What is the smallest unit of an element that has that element’s properties?
Atom
What is the center of an atom?
Nucleus
What are the particles called in an atom’s nucleus that have a positive charge?
Protons
What are the particles called in an atom’s nucleus that have no electric charge?
Neutrons
What are the particles that move around the nucleus that have a negative charge called?
Electron
What two things do atoms need to have the same number of to have no overall charge?
Electrons and Protons
What is the number of protons in an atom called?
Atomic number
An atom’s protons and neutrons have about the same mass, which is called what?
Atomic mass unit or amu
If you add up the mass of all the protons and neutrons in an atom, what do you get?
Atomic mass
What are two or more atoms joined into a single particle called?
Molecule
Molecules have properties that are different than the what that they are formed from?
Elements ?
Dmitri Mendeleev created what?
The Periodic Table of elements
