2.3 Complete Table 1.1 to show the number of protons, neutrons and electrons in the

Question

      isotopes of bromine.                                                                                                       [2]

                                                               Table 1.1

particles

Number of

Protons

Number of neutrons

Number of electrons

3579Br

 

 

 

 

3581Br

 

 

 

 

2.4 Some element's isotopes are radioactive and have several uses.

      Describe one disadvantage of using radioactive isotopes as a source of energy.[1]

 

                                                                                                                                      [6]

 

 

Answer 1

To complete Table 1.1 for the isotopes of bromine, we need to know some basic information about bromine:

• The atomic number of bromine (Br) is 35, which means it has 35 protons.
• The mass numbers of the isotopes are provided (79 and 81) for ³⁵Br and ³⁵Br, respectively.

Using this information, we can fill out the table:

Table 1.1

| Particles | ³⁵Br | ³⁸Br | |-------------------------|--------------------|---------------------| | Number of Protons | 35 | 35 | | Number of Neutrons | 44 (79 - 35) | 46 (81 - 35) | | Number of Electrons | 35 | 35 |

Answer to Question 2.4

One disadvantage of using radioactive isotopes as a source of energy is the potential health risks associated with radiation exposure. This radiation can cause harmful effects on living organisms, including an increased risk of cancer, genetic mutations, and other health issues. These risks necessitate careful handling and regulation, which can complicate the use of these energy sources.