Which grouping of elements share similar characteristics? Periods or Groups?
Groups
The first period conatains which elements?
hydrogen and helium
Who is generally recognized for organizing the periodic table?
Dimitri Mendeleev
How many valance electrons do these elements have?
8
How many valence electrons do these elements have?
7
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.
What is the family group # and period for this element?
group 5. period 2
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
How many elements are there in the periodic table?
118
Each horizontal row of elements on the periodic table is called a ................
period
What are valence electrons?
The electrons in an atom's outermost shell
Which element has 80 electrons?
mercury
How many periods are there in the periodic table?
7
Each vertical column on the periodic table is called a ____________.
group/ family
How many valence electrons do these elements have?
1
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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