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Element Symbols
Atoms
Atomic Math
We Are Family
This and That
100
This symbol for argon is a favorite of many pirates.
What is Ar?
100
These positively charged particles are located in the center of an atom.
What are protons?
100
Lithium (atomic number 3, atomic mass 7) would have this many protons per atom.
What is 3?
100
This family of elements is found in group two of the periodic table.
What are alkaline earth metals?
100
Elements in the same vertical column, which often have similar properties, are known as families or by this other name.
What are groups?
200
This yellow nonmetallic element must be Superman's favorite. He wears its symbol on his chest.
What is sulfur?
200
These tiny, negatively charged particles are constantly spinning around in the outer part of an atom in pathways called shells or energy levels.
What are electrons?
200
Chlorine (atomic number 17, atomic mass 35) would usually have this many neutrons per atom.
What is 18?
200
This family of elements is made up entirely of atoms with complete outer shells.
What are noble gases?
200
The periodic table has seven horizontal rows called by this name.
What are periods?
300
There's nothing "silly" about this element whose symbol is Si.
What is silicon?
300
This term refers to the central core of a atom.
What is the nucleus?
300
If sodium (atomic number 11, atomic mass 23) lost one of its electrons, it would have this number left.
What is ten?
300
All members of this family have only a single valence electron.
What are alkali metals?
300
All elements located in the same period have the same number of these.
What are electron shells (or energy levels)?
400
Everyone knows that water is also called H2O which means it is made of these two elements.
What are hydrogen and oxygen?
400
These uncharged particles are about the same size as protons and located in the same part of the atom.
What are neutrons?
400
Magnesium (atomic number 12, atomic mass 24) would have this many valence electrons.
What is two?
400
Group 17 elements like chlorine and fluorine are part of this family of elements.
What are halides (or halogens)?
400
Although hydrogen does not belong to any family of elements, it is usually placed with the alkali metals because it has the same number of these.
What are valence electrons?
500
This element was once known as "natrium" which explains its unusual symbol.
What is sodium?
500
Electrons found in the outer shell of an atom are known by this name.
What are valence electrons?
500
The element lead would have this number of valence electrons. HINT: It is in the same family as carbon (atomic number 6).
What is four?
500
These four families are named after the first element in their group.
What are boron, carbon, nitrogen and oxygen?
500
This Russian scientist first created the periodic table in 1869.
Who is Dmitri Mendeleev?