Category 1: History & Structure
He created an early periodic table in the 1800s by arranging elements in order of increasing atomic mass.
Who was Dmitri Mendeleev?
Making up about 80% of all elements, these are shiny, malleable, and good conductors of heat and electricity
What are metals?
Clue: Group 18 elements have full outer energy levels, making them chemically unreactive or inert.
Answer: What are the noble gases?
Clue: Moving left to right across a period, atomic radius follows this general trend.
Answer: What is decreases?
Clue: This type of formula displays the lowest whole-number molar ratio of atoms of each element present in a chemical compound.
Answer: What is an empirical formula?
Henry Moseley used X-rays to prove that elements should be arranged by this fundamental property instead of mass
What is atomic number (or number of protons)?
Bordering the stair-step line, these elements (like Silicon and Boron) have properties intermediate between metals and nonmetals.
Answer: What are metalloids?
Clue: Group 1 elements (except Hydrogen) have 1 valence electron and react vigorously or explosively with water.
Answer: What are the alkali metals?
Clue: Atomic radius increases down a group because electrons are added to new, larger principal units of this type.
Answer: What are energy levels?
The chemical name for the molecular compound CO2, which consists of one carbon atom and two oxygen atoms.
Answer: What is carbon dioxide?
This law states that when elements are arranged by increasing atomic number, their chemical and physical properties repeat periodically
What is the Periodic Law?
Clue: Located in the upper right of the periodic table, these elements are poor conductors and are brittle as solids.
Answer: What are nonmetals?
Clue: Known as "salt-formers," this Group 17 family contains highly reactive nonmetals with 7 valence electrons.
Answer: What are the halogens?
Clue: Between Lithium (Li), Sodium (Na), and Potassium (K), this element has the largest atomic radius.
Answer: What is Potassium (K)?
Clue: The total number of atoms contained in a single molecule of dinitrogen tetroxide (N2O4).
Answer: What is 6? (2 nitrogen atoms + 4 oxygen atoms)
On the periodic table, horizontal rows are called periods, while vertical columns are called this
What are groups (or families)?
Clue: Mercury (Hg) is unique among metallic elements at room temperature because it exists in this physical state.
Answer: What is a liquid?
Clue: Group 2 elements contain 2 valence electrons and form alkaline (basic) solutions in water.
Answer: What are the alkaline earth metals?
Clue: The minimum amount of energy required to completely remove the outermost electron from a neutral gaseous atom in its ground state
Answer: What is first ionization energy
A compound has an empirical formula of CH2 (mass = 14 g/mol) and an actual molar mass of 56 g/mol. Its molecular formula is this.
What is C4H8?
Tellurium is placed before Iodine on the periodic table even though Tellurium has a higher value for this property.
What is atomic mass?
Clue: Transition metals are located in Groups 3–12 and correspond to the filling of this specific electron block.
Answer: What is the $d$-block?
Clue: Located in the $f$-block pulled below the main table, these two inner transition series include many radioactive elements.
Answer: What are the lanthanides and actinides?
Clue: Excluding the noble gases, this element in the upper right corner of the periodic table has the highest electronegativity value on the Pauling scale (4.0)
Answer: What is Fluorine ($\text{F}$)?
Clue: An empirical formula is CH2O (mass = 30 g/mol). If the compound's actual molar mass is 180 g/mol, the multiplier used to find the molecular formula is this.
Answer: What is 6?