Atoms
What are the 3 subatomic particles?
Protons, Neutrons and Electrons
The smallest unit of matter
what is in the nucleus of the atom?
protons and neutrons
This type of mixture has parts that can be easily seen and sorted, like a salad
Heterogeneous mixture
A change that alters the form of a substance but not its properties
Physical change
what charge do protons have?
positive
what charge do electrons have?
negative
what charge do neutrons have?
neutral
Homogeneous mixture
A change that turns a substance into a new substance
Chemical change
where are the electrons in the atom?
orbiting the nucleus in the shells
A bond that forms between a metal and a nonmetal in which one atom "steals" electrons from the other is called a(n)
Ionic bond
Columns (vertical) in the periodic table are called
Groups
A homogeneous mixture that involves a solute being dissolved in a solvent is called a(n)
Rotting or decomposing
Chemical change
what does the atomic number tell you?
how many protons in the atom of the element
Covalent bond
Rows (horizontal) in the periodic table are called
Periods
A heterogeneous mixture that has undissolved particles that settle if left undisturbed (like muddy water) is called a(n)
Suspension
Any change in state of matter, like melting or boiling
Physical change
How many valence electrons must an atom have in order to be considered "stable"?
8
How do you figure out how many neutrons are in an atom of the element?
Subtract the atomic number from the atomic mass
How do you find out how many valence electrons an atom has?
By looking at what Group it is in.
(NOTE: If the Group number has two digits, use the second digit!)
True or false: Forming a mixture is a type of chemical reaction.
False. Components of a mixture keep their properties and do not chemically change.
Cooking or burning (combustion)
Chemical change