Periodic Table
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19 terms
Terms | Definitions |
|---|---|
 An element that is a very reactive gas is most likely a member of | halogens |
| Most elements in the periodic chart are __. | metals |
| Moseley rearranged the elements in Mendeleev's periodic table in terms of ___. | atomic number |
| The element _____ is a metalloid. | silicon Si |
| Most metals______. | are made of atoms with few electrons in their outer energy level |
| 80 HG Mercury The Atomic mass of mercury is ___. | 200.6 |
| Each square on the periodic table includes an element's____. | name, chemical symbol, atomic number and atomic mass |
| The elements in a period on the periodic table become___. | less metallic moving from left to right |
| On the periodic table a column of elements is called_____. | a group or family |
| On the periodic table, a row of elements is called _____. | period |
| Why are halogons considered to be the most reactive group of nonmetals? | their atoms gain only one electron to have a complete outer level |
| Which of the following is the least reactive? | noble gas |
| Elements in a family or group in the periodic table often share similar properties because____. | their atoms have the same number of electrons in their outer energy level |
| 16. Atoms of most metallioids have _____ electrons in their outer energy level. | about a half complete set of |
| 15. Atoms of one group of nonmetals, the noble gases, have ___ electrons in their outer energy level. | a complete set of |
| Atoms of most nonmetals, have ___ electrons in their outer energy level. | an almost complete set of |
| Which of the following metals is most reactive? | lithium (Li) |
| In the periodic table, elements are classified as ___ according to their properties. | metals, nonmetals, and metalloids |
| How many elements are in the first period of the periodic table | 2 |
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