Periodic table
Ions
Isotopes
History
Miscellaneous
100
Halogens
What family has 7 valence electrons?
100
electrons
What is lost when cations form?
100
neutrons
What is different from isotope to isotope?
100
Dalton
Who wrote first about an atomic theory?
100
Au
What is the element symbol for gold?
200
Noble gases
What group is inert?
200
halogens
What group gains one electron to form ions?
200
20
How many protons are in neon-30?
200
Beehive
Name simple one model to explain the Quantum Mechanical model of an atom.
200
Pb
What element causes brain damage in brains of children?
300
Hydrogen
What is the nonmetal with the least electrons?
300
+2
What is the charge on an ion that has lost 2 electrons?
300
Cathode Ray
What experiment did Thomson use to find electrons?
300
protons
atomic number ALWAYS equals....
400
Stairstep
What splits the metals from the nonmetals?
400
Noble gases
What group on the periodic table do most elements want to become like in terms of how many electrons they need to be stable?
400
Fluorine
What element has 9 protons?
400
Gold foil
What experiment did Rutherford use to find the nucleus?
400
1
How many carbons are in methane?
500
18
How many groups are on the periodic table?
500
protons and neutrons
What are in the nucleus of an atom?
500
Democritus, Dalton, Thomson, Rutherford, Bohr
Put the following in order from early to recent: Dalton, Thomson, Bohr, Rutherford, Democritus
500
To prove the Law of Conservation of matter
Why do we need to balance chemical reactions?
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