Lewis structure
In Lewis dot structures the electrons are represented as solid dots. In molecule, two oxygen atoms share four electrons and form a double bond completing their respective octets. The four bonded electrons are shown in between two O atoms. The rest of the 4 electrons are present on each oxygen atom as lone pairs.
Lewis structure Sample Questions
Question 1: How many total valence electrons are present in
a) 4 b) 8
c) 12 d) 8
Answer: Option c) 12
Explanation: Each oxygen atom has 8 electrons, 6 of which are valence electrons. There are two O atoms in
Question 2: What kind of bond is present in
a) Covalent bond b) Ionic bond
c) Co-ordinate bond d) None of the above
Answer: Option a) Covalent bond
Explanation: O is a non-metal. Bond formed between two nonmetals is covalent and is formed by sharing of electrons. In
Question 3: What do the two lines represent in Lewis structure of
a) Three lone pairs b) Three electrons
c) Triple bond d) Double bond
Answer: Option d) Double bond
Explanation: In the Lewis structure of
Question 4: Which of the following statements about lewis structure of
a) There are 8 nonbonding electrons. b) There are 2 bonding electrons.
c) There are two lone pairs. d) There are two double bonds.
Answer: Option a) There are 8 nonbonding electrons.
Explanation: Each oxygen atom has 6valence electrons. Out of these 6 , each O atom uses two electrons in bonding with each other and 4 electrons are left on both O atoms. Thus, total of 8 unpaired electrons (four lone pairs) are there in lewis structure of
Question 5: Oxygen molecule (
a) True b) False
Answer: Option b) False
Explanation: Each O atom is surrounded by four dots (lone pairs) and two solid lines (double bond), representing another 4 electrons in the double bond. So each O is surrounded by 8 total valence electrons, completing the octet and making it stable.
Question 6: How many bonding electrons are there in
a) 2 b) 3
c) 4 d) 6
Answer: Option c) 4
Explanation: An oxygen atom has a total of 8 electrons, out of which there are 6 valence electrons. In a
Question 7: How many double bonds are there in lewis structure of
a) 0 b) 1
c) 2 d) 3
Answer: Option b) 1
Explanation: In a
Question 8: What do the two dots on an atomic symbol represent in a lewis structure?
a) Lone pair b) Single bond
c) Double bond d) An unpaired electron
Answer: Option a) Lone pair
Explanation: The lone pair of an atom is represented by two solid dots on the atomic symbol, in a lewis structure.
Question 9: Valence electrons are-
a) Total electrons in an atom b) Electrons in outermost shell
c) Noble gases d) Electrons in outermost subshell
Answer: Electrons in outermost shell
Explanation: Valence electrons are electrons present in the outermost shell of an atom, and can participate in the formation of a chemical bond with other atoms.
Question 10: Pick the incorrect statement about
a) There is a double bond present. b) Each oxygen has a lone pair.
c) The nature of bond present is covalent. d) Total valence electrons are 12.
Answer: Option b) Each oxygen has a lone pair.
Explanation: Each oxygen atom has 6 valence electrons. Out of these 6 , each O atom uses two electrons in bonding with each other and 4 electrons are left on both O atoms. Thus, total of 8 unpaired electrons (four lone pairs) are there in lewis structure of
Frequently Asked Questions
What is the correct Lewis structure for o2?
In an oxygen molecule, the two oxygen atoms share a double bond represented by two solid parallel lines between two O atoms. Each bond is formed by a pair of electrons. A double bond means a total of 4 electrons, 2 coming from each oxygen atom. Each oxygen atom is surrounded by 8 electrons and thus has a complete octet and stable state. The four dots on each oxygen atom represent lone pairs of electrons.
What is the Lewis dot structure for 
?
In Lewis dot structures the electrons are represented as solid dots. In
How many bonding electrons are in the lewis structure of ?
Each oxygen atom has six valence electrons and they tend to complete their octet of electrons by sharing or receiving electrons from other atoms. In a
So, there are 4 bonding electrons in a
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