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Chap 5 fill in
| Question | Answer |
|---|---|
| element 3, lithium has one valence electron, and element 4, beryllium, has two valence electrons. Element 5, boron, has _ valence electrons | 3 |
| Mendeleev organized elements in his periodic table in order of increasing ___ | mass |
| reactive elements, such as alkali metals and halogens, are found in nature only as ____ | compounds |
| the pattern of repeating properties of elements revealed in the periodic table is known as the ___ | periodic table/law |
| one way to demonstrate reactivity among the alkaline earth metals, group 2A, is to observe what happens when they are placed in ___ | water |
| Fertilizers usually contain two elements group 5A, which are ___ and phosphorus | Nitrogen |
| Elements can be classified as metals, nonmetals, and ____ | Metalloids |
| Although they are called ___ lights, they can contain any noble gas | neon |
| The two most reactive groups of elements in the periodic table are the alkali metals and the ___ | Halogens |
| To determine the atomic mass of an element, you would take a ___ average of the isotopes that makeup that element | weighted |
| Hydrogen does not have the typical properties of a metal. However, hydrogen is located above Group 1A because it has one _____ | valence electron |
| The atomic mass unit (amu) is defined as one-twelfth the mass of a ____ -12 atom | carbon |
| Metals that grow dull when exposed to air are more ____ than metals that remain shiny | reactive |
Created by:
Emilylichtle