click below
click below
Normal Size Small Size show me how
Honors Chem Ch 5
| Question | Answer |
|---|---|
| actinides | elements 90 to 103, placed at the bottom of the periodic table for convenience |
| alakali metals | group 1 on the periodic table, have one valence electron |
| alkali earth metals | group 2 on the periodic table, have two valence electrons |
| anion | a negative ion formed when an atom gains one or more electrons |
| atomic radius | the size of an atom; atoms get larger as you go down a group and smaller as you go across a period |
| cation | a positive ion formed when an atom gains one or more electrons |
| electronegativity | the ability of an atom in a compound to attract electrons to itself; Fluorine is the most electronegative atom |
| halogens | group 17 on the periodic table, need one more electron to fill their valence shell |
| lanthanides | elements 58 to 71, placed at the bottom of the periodic table for convenience |
| ionization energy | the amount of energy required to remove an electon from an atom; it takes more energy to remove atoms that are closer to the nucleus or held tightly by more protons in the nucleus |
| main-group elements | elements found in the main body of the periodic table, includes the s block and p block elements |
| noble (inert)gas | column 18 on the periodic table, unreactive because they have full valence shells |
| the periodic law | when the elements are arranged in order of increasing atomic number, elements with similar properties appear in the same group |
| periodic table | an arrangement of all known elements into groups and periods, arranged by increasing atomic number |
| transition metal | metals in the center of the periodic table that have varying numbers of valence electrons |
| Mendeleev | Chemist who put the elements on a table in order of increasing atomic mass |
| Mosely | Chemist who rearranged the periodic table to put the elements in order of increasing atomic number |