Matter Unit Review

What is at the center of every atom?

• An electron
• A compound
• A nucleus
• A molecule

Which two particles make up the nucleus of an atom?

• protons and electrons
• protons and neutrons
• molecules and compounds
• neutrons and electrons

What is the role of an electron in an atom?

• live inside the nucleus and carry a neutral charge
• circle the nucleus and have a positive charge
• live inside the nucleus and have a negative charge
• circle the nucleus and have a negative charge

What determines the type of element an atom makes?

• The size of the nucleus
• The number of protons
• How much an atom weighs
• The number of neutrons

What forms when two atoms combine? 

• A nucleus
• A proton
• A molecule
• A neutron

Which of the following cannot be broken down into something simpler?

• A compound
• An element
• A mixture
• A chemical formula

Which of these is most like a recipe? 

• An element
• A periodic table
• An electron formula
• A chemical formula

What needs to occur in order for elements to form a compound?

• An elemental reaction
• An atomic reaction
• An electric reaction
• A chemical reaction

Which is NOT an example of a compound?

• H₂O
• NaCl
• CO₂
• H

What is different about Hydrogen and Helium atoms?

• The have different numbers of electrons and protons.
• They have different numbers of atoms.
• They are different.