Answer 1)
True
Explanation : To achieve an octet state in valence energy level, an oxygen atom will gain two electrons because as per the definition of octet rule, "The atoms<span> of mainly main-group elements tends to get combined in such a way that each </span>atom gets eight electrons in its last valence<span> shell, giving it the nearest same </span>electron<span> configuration as a noble gas". </span>
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</span>So, in the case of oxygen which has 8 electrons and it will accommodate 2 electrons in its first shell and rest 6 in its last valence shell. In order to achieve the octet state it's easier for the atom to gain 2 electrons rather than giving up rest 6 electrons. Hence, it is true that it gains 2 electrons to complete the octet state.
Answer 2)
True
Explanation : The electronic configuration of Krypton [Kr] is
![1 s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 3d^{10}4s^{2} 4p^{6}](https://tex.z-dn.net/?f=1%20s%5E%7B2%7D%20%202s%5E%7B2%7D%202p%5E%7B6%7D%20%203s%5E%7B2%7D%203p%5E%7B6%7D%203d%5E%7B10%7D4s%5E%7B2%7D%204p%5E%7B6%7D)
The abbreviated form of any element can be written as the nearest noble elemental configuration, along with the remaining extra distributed electrons in other orbitals;
Hence, the electron configuration of Cesium [Cs} is
which can be also written as Cs = [Kr]
Answer:
* Properly dispose of hazardous household items.
* Reduce or eliminate use of fertilizers and chemical herbicides and pesticides.
* Make an appointment to service your septic system
Landscape with native plants.
* Eliminate bare spots in your yard.
* Make a rain garden.
WAS THIS HELPFUL......
we have,
wavelenght=c/f
where c= 3×10^8 m/s
f=6.3×10^12 s^-1
so wavelength=(3×10^8)/(6.3×10^12)
=0.476×10^-4 m
Answer:
D
Explanation:
I think it's D but not 100% sure
Answer: Wind, in climatology, the movement of air relative to the surface of the Earth. Winds play a significant role in determining and controlling climate and weather.