Term
| who was Dimitri Mendeleev?what did he create? |
|
Definition
| he was a russian chemist and a chemistry teacher: he created the periodic table. |
|
|
Term
| how did he arrange his creation? |
|
Definition
| by increasing atomic mass in the same column. |
|
|
Term
| where so a set properties repeat on the periodic table? |
|
Definition
|
|
Term
| what value increases exactly by one from left to right across a row of the periodic table? |
|
Definition
|
|
Term
| how is the arrangement of the modern periodic table that same as Mendeleev's? |
|
Definition
|
|
Term
| each row in the periodic table is called a _______. |
|
Definition
|
|
Term
| each column in the periodic table is called a __________. |
|
Definition
|
|
Term
| what known as the pattern of repeating properties of elements |
|
Definition
|
|
Term
| how is the atomic mass of an element determined? |
|
Definition
| weighted average of the masses of the masses of the elements isotopes. |
|
|
Term
| what is used to define an atomic mass unit? what is the abbreviation? |
|
Definition
|
|
Term
| how is an elements isotope used to find the atomic mass? |
|
Definition
| wighted average of the masses of the elements isotopes. |
|
|
Term
| what are the 3 classes of elements? |
|
Definition
| metals nonmetals and metalloids. |
|
|
Term
| give two characteristics of a metal. |
|
Definition
| not brittle, conductivity, solid at room temp. |
|
|
Term
| describe two characteristics of a nonmetal. |
|
Definition
| brittle, low boiling point, poor conductivity. |
|
|
Term
| what happens o nonmetals at room temp? |
|
Definition
| they turn to gases and brittle. |
|
|
Term
| what is the most nonreactive nonmetal |
|
Definition
|
|
Term
|
Definition
| elements with properties that fall between those of metals and nonmetals. |
|
|
Term
| across a period from left to right, how do the elements change? |
|
Definition
| become less metallic to more non metallic |
|
|
Term
| what is a valence electron? |
|
Definition
| e- that is in the highest occupied energy level of an atom |
|
|
Term
elements in the same group have_______properties.
why? |
|
Definition
similar
because they have the same number of valence electrons. |
|
|
Term
| what are the elements in group 1a called? |
|
Definition
|
|
Term
| how many valence electrons have to be extremely reactive? |
|
Definition
|
|
Term
| to keep the valence electrons from reacting, what are they stored in? |
|
Definition
|
|
Term
| where are the alkaline earth metals located? |
|
Definition
|
|
Term
| what are these medals used for? |
|
Definition
| photosynthesis, chalk and coral |
|
|
Term
| group 3a contains the _____ family |
|
Definition
|
|
Term
| what is the most abundant METAL in earths crust? |
|
Definition
|
|
Term
| in group 4a of the carbon family , what do most of the most compounds in your body contain? |
|
Definition
|
|
Term
| most fertalizers contain what elements from group 5a... |
|
Definition
|
|
Term
| ___________is the most abundant ELEMENT in earths crust. the element that is found in nature only in compounds is SODIUM |
|
Definition
|
|
Term
| how are halogens similar? |
|
Definition
| have the same chemical properties |
|
|
Term
| the most reactive NONMETAL is also the halogen ______ in group 7a |
|
Definition
|
|
Term
| which column contains the most reactive metals? |
|
Definition
|
|
Term
| elements in group 8an are called the _____ ______ |
|
Definition
|
|
Term
| list 3 characteristics of the noble gases. what can they be used for? |
|
Definition
colorless, odorless, and extremely unreactive
they can be used for neon lights |
|
|
