Intro to the Periodic Table
What kind of properties did early chemists use to sort the elements into groups?
Chemical and physical properties
What does the periodic table usually display in the boxes for each of the elements?
The symbols, names, and information about the structure of their atoms
What is an ion?
An atom or group of atoms that has a positive or negative charge
What are valence electrons?
The electrons in the highest occupied energy level of an element's atoms
What is an ionic compound?
A compound composed of cations and anions
How did Mendeleev arrange the elements in his periodic table?
In order of the increasing atomic mass
What are the elements called in Group 1A?
Alkali metals
How are positive and negative ions formed?
When electrons transfer between atoms
How did you find the number of valence electrons in an atom?
By looking at the group number
What are ionic bonds?
The electrostatic forces that hold ions together in ionic compounds
How are the elements arranged in the modern periodic table?
In order of the increasing atomic number
What are the elements in Group 2A called?
Alkaline Earth Metals
What is a cation?
An ion with a positive charge
What are electron dot structures?
Diagrams that show the arrangement of valence electrons in the atoms of an element as dots
What does a chemical formula show?
The number of atoms in each element in the smallest unit of a substance
What are the three classes of elements?
Metals, metalloids, and nonmetals
What are the nonmetals in Group 7A called?
Halogens
What is an anion?
An ion with a negative charge
How much is an octet?
A set of eight
Do ionic compounds generally have high or low melting points?
What does the IUPAC stand for?
The International Union of Pure and Applied Chemistry
What are the elements in Group 8A called?
Noble gases
The energy required to remove an electron from an atom is called.....
Ionization Energy
How is a cation produced?
When an atom loses one or more valence electrons
What can happen when an ionic compound is melted or dissolved in water?
An electric current