The number of protons an element has. This is used to arrange all the elements of the periodic table.
What is the atomic number?
100
A subatomic particle with very little mass and a negative charge.
What is an electron?
100
Elements most likely to be malleable, ductile, lose electrons, or conduct electricity.
What are metals?
100
The chemical formula for silver fluoride.
What is AgF.
100
Electrons found on the outermost orbital of an atom.
What are valence electrons?
200
A set of elements arranged in a column on the periodic table to show similar reactive properties.
What is a family?
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
An element which has some properties of a metal and some properties of a non-metal.
What is a metalloid?
200
The ratio of Aluminum to Oxygen ions in Aluminum oxide.
What is 2:3 (or, what is 2 aluminums for every 3 oxygens)?
200
This family on the periodic table all have 2 electrons in their valance shell.
What are alkali earth metals?
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.
What is an ion?
300
Colour changes, heat/light/sound is produced, bubbles of gas form, or a precipitate (solid) forms.
What are signs of a chemical change?
300
A charged molecule with two or more non-metal elements bonded covalently.
What is a polyatomic ion?
300
A visual representation of an atom that shows the number of protons and neutrons 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 are highly reactive with water.
What are alkali metals?
400
The smallest quantity of an element that still retains the specific properties of that element.
What is an atom?
400
A reaction that gives off energy (often in the form of heat).
What is an exothermic reaction?
400
Something that is included in a chemical name for a compound with a multivalent metal.
What is a roman numeral?
400
The maximum number of electrons found in the first three "shells" of a Bohr diagram.
What are 2, 8, and 8?
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
An example of a physical change.
Eg. What is ice melting? What is paper being torn?
500
Numbers on the periodic table which represent how many valence electrons an element can gain or lose.
What are ionic charges?
500
The numbers on the periodic table that represent how many valence electrons an element can gain or lose when forming an ionic compound.