This is created when an atom adds or subtracts neutrons from its nucleus.
What is an isotope?
100
This is a specific region of an electron cloud. The lowest one is located closest to the nucleus.
What is an energy level?
100
This is the name of a column in the Periodic Table where the elements tend to have similar chemical and physical properties.
What is a group?
100
This is the name for the first group in the Periodic Table. It includes the elements Lithium, Sodium, and Potassium. Its elements all tend to be silvery gray, soft, and have low densities.
What are the Alkali Metals?
100
An alkali metal will readily react with a noble gas to form a salt.
What is false. It will react with a halogen.
200
This models of an atom has the electrons moving around the nucleus in well-defined paths like planets in orbit.
What is the Bohr Model?
200
These are the outermost electrons in an atom.
What are the Valence electrons?
200
These elements are shiny and conduct heat and electricity well. They are located on the left and in the middle of the Periodic Table.
What are Metals?
200
These metals include groups 3 to 12 on the Periodic Table. They include such metals as copper, gold, and iron. They are less reactive than the Alkali and Alkaline Earth metals.
What are the Transition metals?
200
The first energy level is closest to the nucleus and has the lowest energy level.
What is true?
300
This is the sum of the protons and neutrons in an atom.
What is the mass number?
300
This rule states that atoms are most stable when they have a full set of valence electrons.
What is the Octet rule?
300
These elements are sometimes called semimetals. They may be shiny but also brittle. They can conduct electricity but only under certain circumstances. They are located along a zigzag line on the right hand side of the Periodic Table.
What are the Metalloids?
300
This is the name for the members of Group 17 on the Periodic Table. They include the elements chlorine, bromine, and iodine. They often react with metals to form salts.
What are the Halogens?
300
Atoms of the Alkaline Earth metals satisfy the octet rule and are unreactive.
What is false? Alkaline Earth metals only have two valence electrons.
400
This is the number of protons in an atom.
What is the atomic number?
400
This is the name of the atom of an element that either gains or loses electrons to become more stable.
What is an ion?
400
The properties of these elements are very diverse. Many are gases at room temperature. They form solids that are brittle and break easily. The solids are dull in appearance. Except for Hydrogen, they are located on the right side of the Periodic Table.
What are the Nonmetals?
400
These are the elements of Group 18. These elements are very stable because they have a full set of valence electrons. They include Helium, Neon, and Argon.
What are the Noble gases?
400
Two isotopes of oxygen differ in the number of protons in the nucleus.
What is false. It differs in the number of neutrons.
500
This is the average mass of the isotopes of an element.
What is the Atomic Mass?
500
This is the charge of an aluminum ion that loses three electrons to become more stable.
What is 3+?
500
This is the name for the elements in a row on the Periodic Table. The atomic number increases by one for each element in its row as electrons fill in the energy levels around the nucleus.
What is a period?
500
These are the two rows of elements that are placed below the Periodic Table to make it easier to read.
What are the Lanthanides and Actinides?
500
Almost all of the mass of an atom is found in the nucleus.