1、__________ is credited with developing the concept of atomic numbers.
A、Ernest Rutherford
B、Dmitri Mendeleev
C、Henry Moseley
D、Michael Faraday
E、Lothar Meyer
2、Elements in the modern version of the periodic table are arranged in order of increasing __________.
A、number of isotopes
B、average atomic mass
C、atomic mass
D、oxidation number
E、atomic number
3、The first ionization energies of the elements __________ as you go from left to right across a period of the periodic table, and __________ as you go from the bottom to the top of a group in the table.
A、decrease, decrease
B、increase, increase
C、are completely unpredictable
D、decrease, increase
E、increase, decrease
4、In general, as you go across a period in the periodic table from left to right: (1) the atomic radius __________; (2) the electron affinity becomes __________ negative; and (3) the first ionization energy __________.
A、increases, increasingly, decreases
B、decreases, increasingly, decreases
C、increases, increasingly, increases
D、decreases, decreasingly, increases
E、decreases, increasingly, increases
5、Which of the following traits characterizes the alkali metals?
A、existence as diatomic molecules
B、very high melting point
C、the lowest first ionization energies in a period
D、the smallest atomic radius in a period
E、formation of dianions
6、Oxides of the active metals combine with water to form __________.
A、metal hydrides
B、metal hydroxides
C、oxygen gas
D、water and a salt
E、hydrogen gas
7、An alkaline earth metal forms a compound with oxygen with the formula __________. (The symbol M represents any one of the alkaline earth metals.)
A、M2O2
B、MO2
C、M2O
D、MO
E、MO3
8、Which non-metal exists as a diatomic solid?
A、phosphorus
B、boron
C、antimony
D、bromine
E、iodine
9、The only noble gas that does not have the ns2np6 valence electron configuration is __________.
A、All noble gases have the ns2np6 valence electron configuration
B、helium
C、krypton
D、neon
E、radon
10、What is the oxidation number of chromium in [Cr(NH3)4Cl2]Cl __________?
A、-2
B、2
C、3
D、0
E、-3
