知到答案Basic Chemistry 基础化学智慧树答案_2022年

第三章

__________ is credited with developing the concept of atomic numbers.
Ernest Rutherford
Michael Faraday
Lothar Meyer
Henry Moseley
答案:Henry Moseley
Elements in the modern version of the periodic table are arranged in order of increasing __________.
oxidation number
number of isotopes
atomic mass
atomic number
答案:atomic number
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.
increase, increase
increase, decrease
decrease, increase
are completely unpredictable
答案:increase, increase
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 __________.
decreases, increasingly, decreases
increases, increasingly, increases
decreases, increasingly, increases
decreases, decreasingly, increases
答案:decreases, increasingly, increases
Which of the following traits characterizes the alkali metals?
formation of dianions
the lowest first ionization energies in a period
existence as diatomic molecules
very high melting point
答案:the lowest first ionization energies in a period
Oxides of the active metals combine with water to form __________.
oxygen gas
metal hydrides
water and a salt
hydrogen gas
答案:metal hydroxides
An alkaline earth metal forms a compound with oxygen with the formula __________. (The symbol M represents any one of the alkaline earth metals.)
答案:MO
Which non-metal exists as a diatomic solid?
boron
bromine
antimony
phosphorus
答案:iodine
The only noble gas that does not have the ns2np6 valence electron configuration is __________.
helium
All noble gases have the ns2np6 valence electron configuration
radon
neon
答案:helium
What is the oxidation number of chromium in [Cr(NH3)4Cl2]Cl __________?
3
-3
0
2
答案:3