Vocabulary
What is a neutral group of atoms that are joined together by one or more covalent bonds called?
molecule
How many elements were on Mendeleev’s periodic table?
63
Describe cations and anions.
Anion=negatively charged ion
Cation=positively charged ion
What is the chemical formula of boron trichloride?
BCl3
The formation of ionic bonds involves the transfer of what subatomic particle?
electrons
What is the force that holds cations and anions together called?
ionic bond
Describe how Mendeleev discovered his periodic table and what he based his table off.
Mendeleev modeled his organization after a card game similar to Solitaire. He listed an element's name, mass and properties.
Name the compound Ba2+ and F1‑ bonded.
Barium Fluoride
What is the name of the molecular compound SF6?
sulfur hexafluoride
Which of the following statements correctly describes the substance with the formula KI?
a. Molecules of potassium iodide contain one atom of potassium and one atom of iodine.
b. There is a one-to-one ratio of potassium ions to iodide ions.
c. Potassium iodide is a molecular compound.
d. Potassium iodide is a polyatomic ion.
B
What is a row in a periodic table of elements called?
period
How did Mendeleev organize his periodic table?
He arranged the elements into rows in order of increasing mass so the elements with similar properties were in the same column.
Noble gases are considered nonreactive, why?
Because their outermost energy level of electrons is full, and there for they do not need to react to achieve a full octet.
What happens to the charge of atoms when they form polar covalent bonds.
The atoms become slightly positive or negative
In what phase are most metals at room temperature?
Solids
What is a chemical bond in which two atoms share a pair of valence electrons called?
covalent bond
Describe was Mendeleev able to predict future elements?
He used the properties of elements located near the blank spaces in his table to predict properties for undiscovered elements.
Which halogen is most likely to react?
B
Describe chemical formulas.
notation that shows what elements a compound contains and the ratio of the atoms or ions of these elements in the compound.
Ionization energies tend to
a. decrease from left to right across a period.
b.) increase from the top of a group to the bottom.
c. increase from left to right across a period.
d.) decrease from the bottom of a group to the top.
C
What is the elements in Group 7A on the periodic table called?
Halogens
Describe how the elements are ordered on the modern periodic table.
The modern periodic table is arranged by increasing atomic number.
The standard on which the atomic mass unit is based is the mass of What type of atom?
Carbon-12 atom
What does the prefix octa mean?
8
Two highly reactive elements in Period 4 are the metal potassium and the
a. metalloid arsenic. b. nonmetal selenium.
c. nonmetal bromine. d. nonmetal krypton