| Word |
 |
|
| Definition |
|
|
| Atom |
The smallest particle of an element that retains its identity in a chemical reaction. |
| Atomic Mass |
The weighted average mass of the atoms in a natural occurring sample of an element. |
| Atomic Mass Unit (AMU) |
One twelve of a carbon-12 atom. |
| Atomic Number |
The number of protons in the nucleus of an atom of that element. |
| Cathode Ray |
A glowing beam that traveled from the Cathode disk to the Anode disk. |
| Electrons |
Negatively charged subatomic particles. |
| Group |
The vertical columns of the periodic table. |
| Isotopes |
Atoms that have the same number of protons but different number of neutrons. |
| Mass Number |
The total number of protons and neutrons in an atom. |
| Neutron |
Subatomic particles with no charge but with a mass nearly equal of that of a proton. |
| Nucleus |
The tiny central core of an atom and is composed of protons and neutrons. |
| Period |
The horizantal rows of the periodic table. |
| Periodic Table |
An arrangement of elements in which the elements are seperated into groups based on a set of repeating properties. |
| Proton |
Positively charged subatomic particals. |
| Daltons Atomic Theory 1 |
1. All elements are composed of tiny invisible particles called atoms. |
| Daltons Atomic Theory 2 |
2. Atoms of the same element are identicle. The atoms of any one element are different from those of any other element. |
| Daltons Atomic Theory 3 |
3. Atoms of different elements can phisically mix together or can chemically combine in simple whole-number ratios to form compounds. |
| Daltons Atomic Theory 4 |
4. Chemical reactions occur when atoms are seperated, joined, or rearranged. Atoms of one element, however never changed into atoms of another element as a result of chemical reaction. |
Biology Lab Midterm
