This is the combination of protons and neutrons in the nucleus (when their amounts are added together).
What is mass number?
100
This is how the periodic table is arranged.
What is by atomic number and properties of the elements.
100
Two hydrogen atoms and one oxygen molecule make up one molecule of this.
What is H2O?
100
Carbon -12 and Carbon -14 are different because they contain different amounts of these.
What is neutrons? (Which makes the mass number different.)
100
Otherwise known as Liquid Silver or Quick Silver, this element was named after a planet and is used in thermometers.
What is Mercury?
200
With the symbol of K, this element is important in nerve and muscle acitivity and is used in glass and soap.
What is potassium?
200
These are the terms for the columns and rows in the periodic table.
What are groups and periods?
200
The definition of a molecule.
What is a particle that contains more than one atom joined together?
200
Out of atoms, molecules, monomers, and polymers, this is the largest form of matter.
What is polymers?
200
Present in hemoglobin (blood) and often used in cookware, this transition metal is the most abundant and least expensive metal.
What is Iron?
300
This is the amount of protons in an element and it defines what element it is.
What is atomic number?
300
This is the reason that the lanthanide and actinide series are below the periodic table
What is to shorten the periodic table?
300
There are this many Hydrogens in this molecule of ammonium carbonate: 2(NH₄)₂CO₃
What is 16?
300
A polymer of starch is composed of these monomers.
What is glucose?
300
This man invented the original "Chart of the Elements" which eventually became known as the Periodic Table?
Who is Dmitri Mendeleev?
400
This element has 3 protons and 1 valence electron.
What is Lithium?
400
This group of metals on the periodic table are softer than most metals and are the most reactive (so reactive, in fact, that they can explode if they are exposed to water).
What is alkali metals?
400
The number of carbon atoms in carbon dioxide.
What is one?
400
Chromium-58 (atomic number of 24) has this many neutrons, protons, and electrons in it.
What is 24 protons, 24 electrons, and 34 neutrons?
400
This highly reactive gas was responsible for the explosion of the Hindenburg in 1937?
What is Hydrogen?
500
In the Bohr model, the second energy level or ring contains up to this many electrons.
What is 8?
500
A group on the periodic table can be used to find these for an atom.
What are valence electrons?
500
This is the importance of the electrons in the outermost orbital.
What is to form bonds with other atoms to make molecules?
500
Selenium -80 has 34 electrons. How many neutrons does it have?
What is 46?
500
She was the first person to win two Nobel prizes, one in physics for the discovery of radio activity and one in chemistry for discovering radium and polonium.