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If an element has 20 protons and an atomic mass of 40, how many neutrons does it have?
20
How is the Periodic Table arranged?
by atomic number
What is the charge of an atom that has an equal number of protons and electrons?
neutral
What is the current model of the atom that states electrons are in a cloud?
electron cloud model
What is the simplest unit of a compound?
molecule
How many electrons can the first energy level hold?
2
Anything that has mass and takes up space
matter
What is the smallest part of an element, made of electrons, protons and neutrons?
atom
Where is most of the mass of an atom?
nucleus
What is the atomic number the same as?
protons
What charge do neutrons have?
neutral or no charge
What charge do protons have?
positive
When molecules or atoms arrange themselves in ordered patterns create this.
crystals
This is what the subscript tells you in a chemical formula.
the number of atoms of an element
Two or more different atoms bonded together
compound
formed when 2 or more atoms join together chemically
molecule
