Select the true statements.

A) BF 3 has a trigonal planar shape.
B) Molecules with three outer atoms always have a trigonal planar shape.
C) NH 3 has a trigonal planar shape.
D) Trigonal planar molecules have three regions of high-electron density around the central at

A) and D)

Explanation:

A) BF 3 has a trigonal planar shape

TRUE.

BF₃ has three bonding pairs and no lone pairs. According to VSEPR theory, it is an AX₃ molecule with trigonal planar geometry.

B) Molecules with three outer atoms always have a trigonal planar shape.

False

NH₃ has three outer atoms but a trigonal pyramidal shape.  

C) NH₃ has a trigonal planar shape

False.

NH₃ has three bonding pairs and one lone pair. According to VSEPR theory, it is an AX₃E molecule with trigonal bipyramidal geometry.

D) Trigonal planar molecules have three regions of high-electron density around the central atom

TRUE

The regions of high-electron density are the three bonding pairs.

i believe it is-

d.) gravity pulled particles of dust and gas together to form planets.