The number of protons an element has. This is used to arrange all the elements of the periodic table in numerical order.
What is the atomic number?
100
A subatomic particle with no mass and a negative charge.
What is an electron?
100
A combination of elements in a set ratio that always has consistent properties.
What is a compound?
100
A written representation of a chemical reaction that does not tell us quantities or states, but does tell us the reactants and products in a given reaction.
What is a word equation?
100
A path on which electrons will follow outside the nucleus of an atom.
What is an orbital?
200
A set of elements arranged in a column on the PT to show similar reactive properties due to the same number of valence electrons.
What is a group?
200
The subatomic particles that are found in the nucleus that contain of over 99% of an atom's mass.
What are protons and neutrons?
200
A combination of substances in variable quantities that can be categorized as homo or heterogeneous.
What is a mixture?
200
A written representation using chemical symbols and chemical formulas to show the change that occurs when substances undergo a change.
What is a chemical reaction?
200
Electrons found on the outermost orbital of an atom.
What are valence electrons?
300
A group of elements with a full outer ring of electrons making them very stable and highly UNreactive.
What are the noble gases?
300
An atom that has gained or lost one or more electrons as a means to fill its outer shell and therefore has either a negative or positive charge.
What is an ion?
300
A combination of substances, often dissolved in water, that has only one phase. This can have varying concentrations (different ratios) of substances present.
What is a solution?
300
The beginning substances of a chemical reaction, shown on the left side of the arrow in a chemical equation.
What are reactants?
300
A visual representation of an atom that shows the number of protons and neutrons found in the nucleus, as well as all the electrons of that atom and which orbital they are found on.
What is a Bohr Diagram?
400
A group of elements that include Potassium and Rubidium that are highly reactive with water.
What are alkali metals?
400
Originally thought to be "indivisible", but has now been determined the be the smallest quantity of an element that still retains the specific properties of that element.
What is an atom?
400
Brass, Water, Salt, Magnesium Dioxide
What are examples of compounds?
400
A known reaction that allows us to test for the presence of certain elements like Hydrogen, Oxygen, and Carbon Dioxide.
What is a Chemical Identification Test?
400
This will be formed by Oxygen, Sulfur, or Selenium to fill it's outermost shell of electrons.
What is an ion with a negative 2 charge?
500
A property of all the elements in the group 'halogens'?
What is high reactivity?
500
A substance containing only one type of atom.
What is an element?
500
This type of substance could be separated into its components through a physical process (ex. filtering, sorting)
What are mechanical mixtures?
500
Iron + Water + Oxygen ------> Rust
What is the word equation for the formation of rust?
500
(P: 3, N:4) in a circle, surrounded by ring with two dots, and a second ring with only one dot.