The question is not answerable. There is NO central atom in C2H2 (ethyn) and there's NO lone pair. All electrons are covalently shared in pairs: three pairs between C and C, one single pair in each C and H bond.
I is the central atom single bonded to the 4 Br atoms. I also has 2 lone pairs of electrons. It may also be written without showing the lone pairs on any of the electrons, but with a negative charge on the I atom instead (that's how it was on my homework).
The factors affecting the shape of the molecules are the bonded e and the lone pairs of electrons
angular with 109.5 degree
Two lone pair on the central selenium and three lone pairs on each chlorine. So total of eight lone pairs.
This is a linear molecule.
One on each side (at 180º) of the central atom.
linear
linear
The lone pair electron region is the place around the central atom where electrons not bonding with another atom can be found. A lone pair of electrons are electrons that are not bonded with other atoms.
electron-group geometry Apex!
It would be trigonal planar. The N central atom has a double bonded O and a single bonded O and one lone electron.
None. The central atom in methanoic acid (HCOOH) is carbon, which has four electrons. One of the electrons is bonded to the lone hydrogen, another electron is bonded to the hydroxide (OH), and the last two are double bonded to the lone oxygen.
I is the central atom single bonded to the 4 Br atoms. I also has 2 lone pairs of electrons. It may also be written without showing the lone pairs on any of the electrons, but with a negative charge on the I atom instead (that's how it was on my homework).
The central atom of this molecule has two lone pairs and four bonded pairs of electrons. Therefore it has the 'square planar' shape.
When there are two atoms bonded to the central atom and no lone pairs, the molecule adopts a linear shape. When lone pairs are present, bent geometry can be present.
Every pair of electrons on the central atom (S) of the Lewis structure of SF6 is shared by an F atom, so therefore there are no lone pairs on the central atom.
Triginal pyramidal. ~apex