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Chapter 5: Problem 23

How many electrons are present in the valence shells of the central atoms in the molecules of \(\mathrm{BeCl}_{2}, \mathrm{BF}_{3}\) and \(\mathrm{PCl}_{5}\) ?

Short Answer

Expert verified
Answer: The number of electrons present in the valence shells of the central atoms in BeCl2, BF3, and PCl5 are 2, 3, and 5 electrons, respectively.

Step by step solution

01

Finding the Group Number of the Central Atom

Identify the group number of the central atoms in the periodic table. Be is in Group 2, B is in Group 13, and P is in Group 15.
02

Calculating Valence Electrons for Be in BeCl2

Since Be (beryllium) is in Group 2, it has 2 valence electrons. So, the central atom Be in the BeCl2 molecule has 2 electrons in its valence shell.
03

Calculating Valence Electrons for B in BF3

B (boron) is in Group 13. It has 3 valence electrons. So, the central atom B in the BF3 molecule has 3 electrons in its valence shell.
04

Calculating Valence Electrons for P in PCl5

P (phosphorus) is in Group 15, so it has 5 valence electrons. Therefore, the central atom P in the PCl5 molecule has 5 electrons in its valence shell.
05

Summing Up the Results

In summary, the number of electrons present in the valence shells of the central atoms in BeCl2, BF3 and PCl5 are: - BeCl2: 2 electrons - BF3: 3 electrons - PCl5: 5 electrons.

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