1.2 Periodic Table
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Atomic number
The number of protons
Who arranged the Table of Elements
Dmitri Mendeleev
When was the Table of Elements arranged
1869
What did Dmitri Mendeleev do
Arrange the table of elements
How was Mendeleev’s Table of Elements arranged
Atomic mass
What was each column on Mendeleev’s table
Elements with similar properties
Why did some elements end up in the wrong columns in Mendeleev’s Table of Elements
He had the wrong atomic mass due to the presence of isotopes
What did Mendeleev do when elements in his Table of Elements were in the wrong column
He switched the order of the elements to keep those with the same properties in the same column
What is most notable about Mendeleev’s Table of Elements
He left gaps for undiscovered elements and predicted their properties using the patterns of the discovered elements
Why wasn’t Mendeleev’s table in order of atomic number
Protons had not been discovered yet
What is the periodic table in order of
Atomic number
What is a column on the periodic table
Group
What is a row on the periodic table
Period
What does the group number correspond to on the periodic table
The number of electrons in the outer shell
What does the period number correspond to on the periodic table
The number of electron shells
Maximum electrons in the first shell
2
Maximum electrons in second shell
8
Maximum electrons in third shell
8
Why did Mendeleev leave gaps on his table of elements
To keep elements with similar properties in the same group