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Chapter 17.3 8th Sci
| Question | Answer |
|---|---|
| Who was it that solved the problem of the periodic table? | Mendeleev |
| Why were there gaps in Mendeleev’s periodic table? | Not all the elements had been discovered |
| How was Mendeleev's periodic table arranged? | Increasing atomic mass and similar properties. |
| Who decided to change it the arrangement of the periodic table? | Moseley |
| How is the modern periodic table arranged? | Increasing atomic number and similar valence electrons |
| In the early 1800s, what did scientists begin using to identify elements? | Electricity / electrolysis |
| For each element, what did these early scientists record? | The melting point, the boiling point, how they reacted with other elements, as well as the atomic mass. |
| What information is provided in each element’s box on the periodic table? | Element name, symbol, atomic number, atomic mass (average or rounded) |
| How are elements represented on the periodic table? | One or two letter symbols (frequently from the first several letters of the element’s name) |
| Where are the metals located on the periodic table? | Left of the stairstep line |
| Where can the metalloids be found? | Touching the stairstep line, right and left |
| Where are the nonmetals located? | Right of the stairstep line |
| What are the elements in groups 3-12 called? | Transition metals |
| What is the name given to Group one? | Alkali group |
| What is one way that the electron configuration in each group is the same for each element? | They have the same number of valence electrons. |
| What are the horizontal rows on the periodic table called? | Periods |
| What are the vertical columns called? | Groups or Families |
| What are the three ways in which elements are classified on the periodic table? | Metals, nonmetals, metalloids |
| What are the properties of metals? | Malleable, ductile, lustrous, conduct heat and electricity |
| What are the properties of nonmetals? | Gaseous or liquid, brittle, not lustrous (as solids), poor conductors |
| What term do we use to describe the human made elements? | Synthetic |
| List two examples of each : solids, liquids and gases on the periodic table | Gold and silver are solids, hydrogen and oxygen are gases, mercury and bromine are liquids at room temperature |
| What is the significance of Hydrogen and Helium in the universe? | Hydrogen and Helium are the lightest atoms. By fusing these atoms in the stars, all other elements can be made. |
| How did we get the heavier elements that are on the periodic table? | The heavier elements are formed by fusion reactions in stars and supernovas. |
| What element can be located by the position coordinates (1,6)? | Cesium |
| What group contains elements whose valence energy levels are all full? | Group 8A, the Noble Gases. |
| Where are the rare earth elements located on the periodic table? | They are the lowest two periods at the bottom of the page. |
| As electrons return to their ground state after heating, they emit | Specific levels of photons (light energy). |
| When heated, each element produces | A specific spectrum of light energy (photons) |
Created by:
judi829
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