A.
To determine: The number of electrons that can be accommodated in the first, second, and third electron shells of an atom.
Concept introduction:
Electrons are continuously moving around the nucleus, and these electrons can exist in discrete orbits. Electron shell is an orbit followed by electron around the nucleus of an atom. “It is a group of atomic orbital’s with the same value of the principal quantum number n”.
B.
To determine: The number of electrons in the atoms of elements like helium, oxygen, carbon, sodium, and chlorine have to gain or lose to obtain a completely filled outer shell.
Concept introduction:
Electrons are continuously moving around the nucleus, and these electrons can exist in discrete orbits. Electron shell is an orbit followed by electron around the nucleus of an atom. “It is a group of atomic orbital’s with the same value of the principal quantum number n”.
C.
To explain: The reactivity of helium and about the bonds that can form between sodium and chlorine.
Concept introduction: Electrons are continuously moving around the nucleus, and these electrons can exist in discrete orbits. Electron shell is an orbit followed by electron around the nucleus of an atom. “It is a group of atomic orbital’s with the same value of the principal quantum number n”.
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