Quiz 1 | Lewis Formulas
How many covalent bonds should form a neutral oxygen atom to follow the octet rule?
Electronic configuration of O (Z = 8): 1s2 2s2 2p4 ⇒ 6 valence electrons
A neutral oxygen atom needs 2 more electrons to follow the octet rule
What type of bond exists between the nitrogen atoms of N2H2?
Which of the following species has a triple covalent bond?
What is the formal charge of boron atom in the molecule BF4-?
nb of valence electrons in a free boron atom: 3
nb of valence electrons in the bound boron atom of BF4-: 4
Formal charge = 3 – 4 = -1
Which of the following atoms could have an expanded valence shell?
Valence shell of Li, O and Ne: n =2
Valence shell of S: n = 3
Expanded valence shell can happen only for atoms with a valence shell n 3
Which of the following atoms has the highest electronegativity?
Electronegativity increases across a period and towards the top of a group in the periodic table