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Chapter 17.3 8th Sci

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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