Question | Answer |
Who is the father of the periodic table? | Dmitri Mendeleev |
periodic | having regular repeated pattern |
periodic law | the chemical and physical properties of elements are periodic functions of their atomic numbers |
period | each horizontal row on the periodic table |
group | a column of elements of the periodic table |
alkali metals | group 1; 1 electron in the outer shell; very reactive; sodium potassium lithium |
alkaline-earth metals | group 2; 2 electrons in outer shell; reactive; beryllium magnesium calcium |
halogens | group 17; 7 electrons in outer level; very reactive; halogen, chlorine, iodine |
noble gases | group 18; non reactive; neon helium argon |
Dmitri Mendeleev | constructed the first periodic table |
metals | most elements are this and are to the left of the zigzag line; few electrons in ourte shell; mostly malleable shiny ductile and good conductors |
nonmetals | right of line; almost a complete set of electrons; most are gases at room temp.; poor conductors; not shiny; not malleable or ductile |
metalloids | aka semiconductors and border the zigzag line; 1/2 set of electrons; sometimes act like metals and sometimes like nonmetals |
in the modern periodic table the elements are arranged in order of increasing | atomic number |
a _______ is a representation of an element usually consisting of one or two letters | chemical symbol |
How is the reactivity of elements related to valance electrons in atoms? | the number of valance electrons in an atom of an element determines many properties of that element including the ways in which the atom can bond with other atoms |
What does the periodic table tell you about the elements? | the periodic table reveals the underlying atomic structure of atoms including the arrangement of the electrons |
electron dot diagram | this includes the symbol of an element surrounded by dots representing the number of valence electrons |