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Atom Structure Atom Theory Periodic Table Element Classifying Moles Final Question Back to Home
100 This is the central core of an atom What is the nucleus? Click here for answer back
200 These are the masses for the three subatomic particles back Click here for answer What is 1 amu for protons and neutrons and almost 0 mass for electrons
300 This is the region where electrons are found according to the modern theory. back Click here for answer What is the electron cloud?
400 This subatomic particle determines what element it is back Click here for answer What is the proton?
100 Rutherford related atoms to this old fashioned English dessert back Click here for answer What is plum pludding?
200 This philosopher came up with the idea of the atom 2000 years ago. back Click here for answer Who is Democritus?
300 Aristotle believed all things were made up of these four substances. back Click here for answer What is fire, water, air, earth?
400 The theory that electrons rotate around the nucleus like planets around the sun was described by this scientist. back Click here for answer Who is Bohr
100 This group is the most reactive metals on the periodic table back Click here for answer What is alkali metals?
200 These elements have the same number of protons but different numbers of neutrons back Click here for answer What are isotopes?
300 Charged atoms like (Na +1 and Br - ) are known as these back Click here for answer What are ions?
400 Elements in the periodic table are arranged in order according to this back Click here for answer What is the atomic number
100 This group of elements are brittle, dull, and do not conduct electricity well back Click here for answer What are nonmetals?
200 This is the group name where the majority of metals are found (groups 3-12) back Click here for answer What are transition metals?
300 This element is the only nonmetal found on the left side of the periodic table back Click here for answer What is hydrogen ?
400 This semiconductor is most known for being used in computers back Click here for answer What is silicon?
100 Molar mass is equal to this and can be found on the periodic table back Click here for answer What is the mass number (atomic mass)?
x atoms of a substance is equal to this back Click here for answer What is 1 mole?
300 This is the unit for molar mass back Click here for answer What is g/mol?
What two things did Mendeleev consider when arranging the periodic table? back Click here for answer The atomic mass and started a new row every time an element repeated it physical/chemical properties.
400 The discovery that 6.02 x equals 1 mole was named after this person. back Click here for answer Who is Avogadro?