Write Lewis dot symbols for atoms of the following elements: Mg, Na, B, O, N, Br.
Answer:
Mg: There are two valence electrons in Mg atom. Hence, the Lewis dot symbol for Mg is:
Na: There is only one valence electron in an atom of sodium. Hence, the Lewis dot structure is:
B: There are 3 valence electrons in Boron atom. Hence, the Lewis dot structure is:
O: There are six valence electrons in an atom of oxygen. Hence, the Lewis dot structure is:
N: There are five valence electrons in an atom of nitrogen. Hence, the Lewis dot structure is:
Br: There are seven valence electrons in bromine. Hence, the Lewis dot structure is:
Question 4.3:
Write Lewis symbols for the following atoms and ions:
S and S2–; Al and Al3+; H and H–
Answer:
(i) S and S2–
The number of valence electrons in sulphur is 6.
The Lewis dot symbol of sulphur (S) is
.
The dinegative charge infers that there will be two electrons more in addition to the six valence electrons. Hence, the Lewis dot symbol of S2– is
.
(ii) Al and Al3+
The number of valence electrons in aluminium is 3.
The Lewis dot symbol of aluminium (Al) is
.
The tripositive charge on a species infers that it has donated its three electrons. Hence, the Lewis dot symbol is
.
(iii) H and H–
The number of valence electrons in hydrogen is 1.
The Lewis dot symbol of hydrogen (H) is
.
The uninegative charge infers that there will be one electron more in addition to the one valence electron. Hence, the Lewis dot symbol is
.
Question 4.4:
Draw the Lewis structures for the following molecules and ions:
H2S, SiCl4, BeF2,
, HCOOH
Answer:
Please solve the questions.
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Answer:
Explanation:
Mg: There are two valence electrons in Mg atom. Hence, the Lewis dot symbol for Mg is: M..g
Na: There is only one valence electron in an atom of sodium. Hence, the Lewis dot structure is: Na.
B: There are 3 valence electrons in Boron atom. Hence, the Lewis dot structure is: ⋅B.⋅
O: There are six valence electrons in an atom of oxygen. Hence, the Lewis dot structure is: :O..:
N: There are five valence electrons in an atom of nitrogen. Hence, the Lewis dot structure is: :N...
Br: There are seven valence electrons in bromine. Hence, the Lewis dot structure is: :B...r:
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