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Answers
Explanation:
1) As electron revolving in a shell is associated with a definite amount of energy. The energy changees when it jumps to another shell that is so say when it goes from one level of energy level to another. Thus shell also gives the energy of a electron besides its location and are therefore called energy levels.
2) In oxygen molecule, the double bond contains one sigma and one pi bond.
Oxygen atom has six valence electrons. Oxygen molecule has two oxygen atoms. Each O atom shares 2 electrons to form two covalent bonds out of which one is sigma bond and other is pi bond. Sigma bond is formed by axial overlap 2p atomic orbitals of oxygen and pi bond is formed of lateral overlap of 2p atomic orbitals of oxygen. In oxygen molecule, both oxygen atoms have completed their octet.
3) The mass number is not equal to the atomic mass because of isotopes.
Mass number is simply the number of protons and neutrons.
The actual atomic mass of an atom is the weighted average of all existing atoms & isotopes per element. The isotopes have a different number of neutrons than protons.
4)The noble gases are the chemical elements in group 18 of the periodic table. They are the most stable due to having the maximum number of valence electrons their outer shell can hold. Therefore, they rarely react with other elements since they are already stable.
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Answer:
(1) the energy changes when it jumps to another shell that is so say when it goes from one level to energy level to another thus sell also give the energy electrons besides its location and are therefore called energy level
(2)oxygen molecules have six valences electron.oxygen molecules has two oxygen atom each O atoms share 2electrons to form two covalent bound.
(3)the actually atomic mass of an atom is the weight average of all existing atom and isotopes per element
(4)the noble gas are chemical element in groups 18 of the periodic table they are most stable due to having a maximum number of valenced electrons their outer shell can hold