1) Dmitri Mendeleev organized the chemical elements: a) by number of electrons b) by increasing atomic weight and similar propertie c) by increasing atomic number and similar properties d) in alphabetical order 2) The elements in the present periodic table are arranged according to their: a) atomic masses b) mass number c) atomic number d) atomic weight 3) A vertical column in the periodic table is called a: a) valence b) branch c) group d) period 4) A horizontal row in the periodic table is called a: a) valence b) branch c) group d) period 5) The majority of the elements in the periodic table are: a) noble gases b) non-metals c) metalloids d) metals 6) What does Bohr's theory state? a) Electrons occur around the nucleus in electron shells that have a limited capacity b) Electrons are located randomly around an atom's nucleus c) Electrons occur in shells of unlimited capacity d) Electrons don't occur at all in atoms 7) What is the capacity of the first electron shell? a) sixteen b) eight c) three d) two 8) Which of the following is the electron configuration for carbon: a) C )2e- )8e- )2e- b) C )2e- )6e- c) C )2e- )4e- d) Ca )2e- )8e- )2e- 9) Elements in the some group have: a) similar symbols b) the same number of neutrons c) the same number of valence electrons d) the same number of electrons 10) Elements in the same period have: a) the same number of neutrons b) gradually changing properties c) similar symbols d) identical chemical properties 11) Which element is classified as metalloid? a) Ca b) Cl c) Si d) Zn 12) How many valence electrons does calcium have? a) one b) two c) eight d) twenty 13) How many valence electrons does boron have? a) one b) two c) three d) four

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