History of the Periodic Table
What does the term "periodic table" mean?
Repeating Pattern
Each square on the periodic table represents how many elements?
One
What does the atomic number represent?
The number of protons an element has
Almost 3/4 of the elements on the periodic table are _________.
Metals
This element has an atomic number of 1.
Hydrogen
Who discovered a set of patterns that applied to all elements?
Dimitri Mendeleev
Each element is given a ___________________ , usually given by the discoverer.
Chemical Name
Each column on the periodic table is called a _______, and each row on the periodic table is called a __________.
Group
Period
Metalloids have properties of both __________ and ___________ .
Metals
Nonmetals
This element has 26 protons.
Iron (Fe)
The periodic table arranges elements according to which properties? (List BOTH)
Chemical and Physical
The large one or two letter symbol in a square on the periodic table is called a...
Chemical Symbol
The group on the far right of the periodic table is called...
Noble Gases
All metals are shiny and conduct ___________________ and _____________ .
electricity
thermal energy
This element is in group 16, period 3.
Sulfer (S)
True or False: there will never be more additions to the periodic table because all the elements have been found.
False
The number above the chemical symbol is the element's _________________.
Atomic Number
The group on the far left of the periodic table is called...
Alkali Metals
Where would you find the nonmetals on the periodic table?
The right side (except for Hydrogen)
This element has an atomic mass of 222.
Radon (Rn)
There are ______ groups and ______ periods on the Periodic Table.
18 groups (columns)
7 periods (rows)
The number below an element's symbol is the element's _______________________?
Atomic Mass
Alkali metals react aggressively with ___________, which is the group to the left of the Noble Gases.
Halogens
The periodic table organizes elements by ____________ (increasing or decreasing) atomic mass?
Increasing
These two elements combine to make salt, but they react aggressively with each other.
Na
Cl