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15 questions
Who invented the Periodic Table?
Mendeleev
Bohr
Lewis
Democritus
As you move left to right on a row or period what happens?
Atomic number increases by 1
Electrons decrease
Number of shells decrease
Nothing
What happens to the number of shells as you move down a group?
They decrease by 1
They increase by 1
Nothing
The first energy shell can hold ______ electrons.
2
8
18
All elements in the same row have the same number of shells.
True
False
Sometimes
Mendeleev's genius was his ability to
predict elements that were not discovered yet
organize elements by their mass
had an element named after himself
organize elements by properties
Valence means......
inside
outside
full
Elements in the same group or column have the same ...
# of valence electrons
# of shells
# of protons
Mass Number
Rows on the periodic table are called ___________.
Periods
Sentences
Fences
Elements in the same group have __________
Similar Properties
Same number of shells
Similar Mass
What do all elements in the same period have?
same number of shells
same number of electrons
belong in the same family
Use your periodic table to find which element has 5 protons.
Lithium
Calcium
Boron
Neon
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