Elements and Symbols
History
Trends
Discoveries
Vocab
100

K

What is potasssium

100
The original periodic table was ordered by this
What is their properties
100
Atomic size increases this way across the periodic table
What is top to bottom
100
This is an atom or group of atoms that have a positive or negative charge
What is an ion
200
Cl
What is chlorine
200
The periodic table is now arranged by this
What is atomic number
200
As you go to left to right across the periodic table the atomic size generally does this
What is decreases
200

This is a horizontal row on the periodic table

What is a period

300
Beryllium
What is Be
300
Mendeleev had his periodic table arranged by this
What is atomic mass
300
Ionization energy tends to decrease in this direction
What is top to bottom
300

This man discovered that the periodic table makes more sense to be ordered by atomic mass

Who is Mendeleev

300
This is an element that tends to have properties that are similar to those of metals and nonmetals
What is a metalloid
400
Se
What is selenium
400
Name the law that states when elements are arranged in order of increasing atomic number, there is a periodic repetition of their physical and chemical properties
What is the Periodic Law
400

Ionization energy tends to increase in this direction

What is left to right

400

Electron dot structure of Oxygen?

See Miss Christy
400
This is a vertical column of elements in the periodic table
What is a group
500
Yttrium
What is Y
500
This man left spaces in his periodic table because he knew that there were elements that were missing that had not been found yet
Who is Dmitri Mendeleev
500
In general, electronegativity values increase from left to right within a period. For representative elements, the values tend to do this from left to right
What is increase
500

Only this many elements had been discovered up to the year 1700

What is 13

500
This is a nonmetal in group 7A of the eriodic table
What is a halogen
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