a)In what form does oxygen gas occur in nature ?
b)In what form do noble gases occur in nature?
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b)In what form do noble gases occur in nature?
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Oxygen gas occurs in compound form in water, mixed form in atmosphere and organic tissues.Also found in compound form in glucose . Noble gases are found in atmosphere in very minute traces.2 H denotes two separate atoms of hydrogen while H2 denotes a molecule of hydrogen which is formed when two hydrogen atoms combine chemically.N -denotes one atom of nitrogen
2N denotes two separate atoms of nitrogen
N2 denotes one molecule of nitrogen (formed from combination of two nitrogen atoms),
2N2 denotes two molecules of nitrogen
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Answer in text form are as follow:-
answer (a) =>
the oxygen mainly found in the form of O2 in nature because it has 2 electrons in K shell and 6 electrons in L shell . So, in the last shell of oxygen atom, it has two vacant space or empty space for electrons. so it has the valency of -2.
and because of this, the atom of Oxygen tries to get stable and in order to do that they combine with another oxygen atom and shares two electrons with each other.
answer ( b ) =>
all the noble gas has no empty space are vacant space for the electrons in last shell . so, they are mostly stable and doesn't tries to combine with other elements or the atom of its own.
so they mainly found in the form of single atom like He, Ne, Ar etc.
now, the answers of image are as follows:-
answer (8) =>
as we know that, H represents the one atom of Hydrogen.
so, in same way, 2H represents that there are 2 atom of Hydrogen that is separated from each other and that is not forming any molecule.
on the other hand , H2 represents that there is 2 atom of Hydrogen that is in the molecules. or in other words, H2 represents the group of 2 atom of Hydrogen that shares the electron with each other. H2 doesn't represent the separate atoms while it represent the whole molecule.
answer (9) =>
1) Similarly, here also N represents the one atom of Nitrogen.
2). and again 2N represents Two atoms of Nitrogen that is separated from each other that doesn't from any molecule.
3). N2 represent that there is 2 atom of Nitrogen a particular molecule. that shares electron to each other.
4). 2N2 represents there is two separate molecule that each contain 2 atom of Nitrogen.
hope you are satisfied with my answer