Term
|
Definition
| anything that has mass and takes up space |
|
|
Term
| Democritus believed that the bits of stuff were so small they could no longer do what? |
|
Definition
| be divided into small pieces |
|
|
Term
| What are tiny pieces of matter called? |
|
Definition
|
|
Term
| What does the Law of conservation of Matter? |
|
Definition
| states that matter is not created or destroyed- it only changes form. |
|
|
Term
| Who believed that matter was made of atoms that were too small to be seen by the human eye? |
|
Definition
|
|
Term
| What did Dalton's model become known as? |
|
Definition
| the Atomic Theory of Matter |
|
|
Term
| What are invisible, negatively charged particles? |
|
Definition
|
|
Term
| What did Rutherford call the positively charged, central part of the atom? |
|
Definition
|
|
Term
| What did Rugherford name the positively charged particles in the nucleus? |
|
Definition
|
|
Term
| What did Chadwick call unchanged particles? |
|
Definition
|
|
Term
| What is a special cloud of varying density surrounding the nucleus? |
|
Definition
|
|
Term
| What is matter made of only one kind of atom? |
|
Definition
|
|
Term
| How many elements are known and how many of them occur naturally? |
|
Definition
|
|
Term
| How are the elements organized on the peridic table? |
|
Definition
|
|
Term
| What are the rows in the table called? |
|
Definition
|
|
Term
| What are the columns in the periodic table called? |
|
Definition
|
|
Term
|
Definition
| atoms of the same element that have different numbers of neutrons |
|
|
Term
| What is an atom's mass number? |
|
Definition
| the number of protons plus the number neutrons it contains |
|
|
Term
| What is the weighted average mass of the isotopes of the isotopes of an element and the number found below the element symbol? |
|
Definition
|
|
Term
| What is the unit that scientists use for atomic mass? |
|
Definition
|
|
Term
| What are the three general categories of elements? |
|
Definition
| metals, metalloids, and nonmetals |
|
|
Term
|
Definition
| generallly have a shiny or metallic luster and are good conductors of heat and electricity |
|
|
Term
| All metals are malleable. What does malleable mean? |
|
Definition
| they can be bent and pounded into various shapes |
|
|
Term
| What is matter that has the same composition and properties throughout is called what? |
|
Definition
|
|
Term
| What is a substance whose smallest unit is made up of atoms of more than one element bonded together? |
|
Definition
|
|
Term
| No subscript is used when only one atom of what is present? |
|
Definition
|
|
Term
| What does homogeneous mean? |
|
Definition
|
|
Term
| What does hetrogenous mean? |
|
Definition
| mixture has larger parts that are different from eachother |
|
|
Term
| What tells you which elements make up a compound as well as how many atoms of each element are present? |
|
Definition
|
|
Term
| What is written below and tot he right of each element's symbol that tells you how many atoms of that element exist in one unit of that compound? |
|
Definition
|
|
Term
|
Definition
|
|
Term
| What does the atomic number tell you? |
|
Definition
| the number of protons in the nucleus of each atom of that element |
|
|
Term
| What elements have been made in nuclear reactions by scientists with machines called particle accelerators? |
|
Definition
|
|
Term
| Who discovered the nucleus and protons? |
|
Definition
|
|
Term
| Who discovered the neutron? |
|
Definition
|
|
Term
| Who discovered the electron? |
|
Definition
|
|
