Periodic Tables
This number tells you how many protons an atom has.
What is the atomic number?
The symbol “O” stands for this element.
What is oxygen?
He proposed the first atomic theory in the early 1800s.
Who is John Dalton?
Always wear these to protect your eyes during lab experiments.
What are safety goggles?
This variable is deliberately changed by the scientist in an experiment.
What is the independent variable?
These are the horizontal rows on the periodic table.
What are periods?
The symbol “Na” represents this element, found in table salt.
What is sodium?
The negatively charged particles in an atom.
What are electrons?
If you spill a chemical on your skin, the first step is to do this.
What is rinse with water?
This variable is measured or observed to see how it responds to changes.
What is the dependent variable?
These are the vertical columns on the periodic table.
What are groups or families?
The symbol “Au” stands for this precious metal.
What is gold?
This scientist discovered the nucleus with his gold foil experiment.
Who is Ernest Rutherford?
You should never do this with lab equipment or chemicals.
What is eat or drink?
This type of experiment compares a group that receives the treatment to one that does not.
What is a controlled experiment?
This element is the lightest and is number 1 on the periodic table.
What is hydrogen?
This element has the symbol “Fe.”
What is iron?
This model describes electrons moving in energy levels around the nucleus.
What is the Bohr model?
This piece of equipment is used to put out small fires.
What is a fire extinguisher?
The part of the experiment used as a standard of comparison to see the effect of the independent variable.
What is the control or control group?
The scientist credited with creating the first periodic table.
Who is Dmitri Mendeleev?
This element has the symbol “K” but is not krypton.
What is potassium?
The modern model shows electrons moving in this “cloud-like” region.
What is the electron cloud model?
The first thing you should do if an accident happens in the lab.
What is tell the teacher?
The step in an experiment where you make a prediction based on prior knowledge.
What is a hypothesis?