Question

What is the number of individual atomic orbitals in each of the following sets? A) 7s B) 5d C) 3p D) 1s Enter your answer with integers separated by commas and with no spaces (for example, 4,4,1).

Are the following statements true or false?
True False  Two sigma bonds comprise a double bond.
True False  A double bond consists of two pairs of electrons.
True False  Bonds formed from atomic p orbitals are always sigma bonds.
True False  A pi bond restricts rotation about the sigma bond axis.
True False  A triple bond consists of one pi bond and two sigma bonds.
True False  Side-to-side overlap results in a bond with electron density above and below the bond axis.

Answer 1

Answer-

Number of individual atomic orbitals in each of the following sets-

A) 7s , 7 denotes no of shell means 7^th shell and s orbital which has only 1 orbital

B) 5d , 5 denotes no of shell means 5^th shell and d orbital which has 5 orbital (d_xy,d_yz,d_zx,d_x²-d_y²,d_z²)

C) 3p ,3 denotes no of shell means 3^rd shell and p orbital which has 3 orbital (p_x,p_y,p_z )

D) 1s , 1denotes no of shell means 1^st shell and s orbital which has only 1 orbital.

Number of individual atomic orbitals in each of the given sets (1,5,3,1)

--------------------------------------------------------------------------------------------------------------------------------

• Two sigma bonds comprise a double bond. False

Reason- since a double bond comprises of one sigma and one pi bond

• A double bond consists of two pairs of electrons. True

Reason - since single bond consist of one pair i.e. 2 electrons hence a double bond consist of 2 pairs of electrons.

• Bonds formed from atomic p orbitals are always sigma bonds. False

Reason-because sigma and pi bonds are formation depend on -

a) sigma bonds are formed by head to head overlap like s-s, s-p, s-d or p-d

b)pi bonds are formed by lateral overlap like p-p

• A pi bond restricts rotation about the sigma bond axis. True

Reason-since rotation need comparatively more energy and can deform the bond.

• A triple bond consists of one pi bond and two sigma bonds. False

Reason- since A triple bond consists of 2 pi bond and 1 sigma bond.

• Side-to-side overlap results in a bond with electron density above and below the bond axis. True

Reason-since axis involved in the overlap are not along the horizontal axis.