$$\text{Number of bonds} + \text{Number of lone pairs}$$

Question 1

Which of the following best describes the electron geometry around the central atom in carbon disulfide (CS$$_2$$)?

Accepted Answer

Linear

Question 2

How many electron groups are present around the central atom in hydrogen sulfide (H$$_2S$$)?

Accepted Answer

$$4$$

Question 3

What is the electron geometry of the molecule CH$$_2O ($$formaldehyde)?

Accepted Answer

Trigonal planar

Question 4

A molecule has three electron groups around its central atom. What is its electron geometry?

Accepted Answer

Trigonal planar

Question 5

Which of the following molecules has a tetrahedral electron geometry?

Accepted Answer

NH$$_3$$

Question 6

Determine the number of electron groups around the nitrogen atom in methylamine (CH$$_3NH$_2).$$

Accepted Answer

$$4$$

Question 7

Which of the following statements about electron groups is correct?

Accepted Answer

Electron groups include both bonds and lone pairs around the central atom.

Question 8

What is the electron geometry of the cation AsBr$$_2^+$$?

Accepted Answer

Linear

Question 9

If a molecule has four electron groups around the central atom, what is the expected electron geometry?

Accepted Answer

Tetrahedral

Question 10

Which of the following is the correct formula for calculating the number of electron groups around a central atom?

Accepted Answer

$$	ext{Number of bonds} + 	ext{Number of lone pairs}$$

Question 11

A molecule has two electron groups around its central atom. Which of the following is true about its geometry?

Accepted Answer

It is always linear.

Question 12

Which of the following best describes the electron geometry of water (H$$_2O$$)?

Accepted Answer

Tetrahedral

Question 13

In the molecule CH$$_2O$$, how many electron groups are around the central carbon atom?

Accepted Answer

$$3$$

Question 14

Which of the following molecules has a trigonal planar electron geometry?

Accepted Answer

BF$$_3$$

Question 15

A molecule has four electron groups: two single bonds and two lone pairs. What is its electron geometry?

Accepted Answer

Tetrahedral

Question 16

Which of the following is NOT a valid electron geometry for a central atom with three electron groups?

Accepted Answer

Bent

Question 17

What is the electron geometry of ammonia (NH$$_3$$)?

Accepted Answer

Tetrahedral

Question 18

Which of the following best explains why lone pairs are counted as electron groups when determining electron geometry?

Accepted Answer

Lone pairs occupy space and influence the arrangement of atoms.

Question 19

A molecule has three electron groups: one double bond, one single bond, and one lone pair. What is its electron geometry?

Accepted Answer

Trigonal planar

Question 20

Which of the following is the correct electron geometry for the central atom in the cation AsBr$$_2^+$$?

Accepted Answer

Linear

Electron Geometry and Electron Groups in Molecular Structures

Study Guide - Practice Questions