Who is generally recognized for organizing the periodic table?
Dimitri Mendeleev
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15
What is the family group # and period for this element?
group 5. period 2
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25
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15
How many valance electrons do these elements have?
8
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15
Each horizontal row of elements on the periodic table is called a ................
period
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How many valence electrons do these elements have?
7
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15
The first period conatains which elements?
hydrogen and helium
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15
Based on the periodic table what do you know about these elements?
They all have the number of energy levels/shells.
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15
What must be true of the element represented by the "X"? A) It will have 6 total electrons. B) It will have chemical properties similar to C. C) It will have 28 protons. D) It will have a mass greater than 30.
B. It will have chemical properties similar to C.
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15
A researcher wants to experiment with an element that reacts like sulfur (S) but has a greater atomic mass. Which elements should the researcher select for the experiment?
Selenium, Tellurium, Polonium
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15
How many elements are there in the periodic table?
118
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Which element has 80 electrons?
mercury
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15
How many valence electrons do these elements have?
1
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15
Each vertical column on the periodic table is called a ____________.