name the following element A. two shell both of which are completely filled B. three shall will two Valence Electrons C.metal with valency 3group number 13 and period 3
Answers
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a-since the two shells are completely filled .
its electronic configuration will be 2,8.
the element is neon.
b-2,8,2
the element is magnesium.
c-first two shells are complete and valence shell has 4 electrons so its electronic configuration will be 2,8,4.
the element is silicon.
d-first shell is completely filled and valence shell has three electrons so its electronic configuration will be 2,3.
therefore the element is Boron.
e-first shell can have two 2 electrons.
twice of electrons present in first shell will be 4.
its electronic configuration will be 2,4.
therefore the element is carbon.
hope it helps you
Answer: A. Element with two shell both of which are completely filled - Neon
B. Element with three shell with two valence electrons - Magnesium
C. A metal with valency 3 belongs to group number 13 and period 3 - Aluminium
Explanation:
It is known that shells present in each atom are like K, L, M, N and so on. Shell K in the inner most shell and on moving outwards the shells are L, M, N and so on.
Noble gases are the gases which have completely filled shells or orbitals. For example, atomic number of neon is 10 and its electronic distribution is 2, 8. That means it has two shells which are completely filled.
Atomic number of magnesium is 12 and its electronic distribution is 2, 8, 2. That is, there are 2 valence electrons present in a magnesium atom.
Aluminium is a metal with atomic number 13 and its electronic distribution is 2, 8, 3. This also means that valency of aluminium is +3. This metal lies in group 13 and period 3 of the periodic table.
Learn more about electronic distribution:
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