Use of the Data Booklet is relevant to this question. The isotope $^{99}$Tc is radioactive and has been found in lobsters and seaweed adjacent to nuclear fuel reprocessing plants. Which statements are correct about an atom of $^{99}$Tc? 1 It has 13 more neutrons than protons. 2 It has 43 protons. 3 It has 99 nucleons.

Photo AI

Use of the Data Booklet is relevant to this question - CIE - A-Level Chemistry - Question 32 - 2012 - Paper 1

Question 32

Use of the Data Booklet is relevant to this question. The isotope $^{99}$Tc is radioactive and has been found in lobsters and seaweed adjacent to nuclear fuel repro... show full transcript

Worked Solution & Example Answer:Use of the Data Booklet is relevant to this question - CIE - A-Level Chemistry - Question 32 - 2012 - Paper 1

Step 1

1 It has 13 more neutrons than protons.

96%

114 rated

Answer

To determine if this statement is correct, we note that the atomic number of Technetium (Tc) is 43 (the number of protons). The atomic mass number is 99. The number of neutrons can be calculated using the formula:

$ext{neutrons} = ext{atomic mass} - ext{protons}$

Substituting the values:

$ext{neutrons} = 99 - 43 = 56$

This means that it has 56 neutrons. Therefore, the statement that it has 13 more neutrons than protons is incorrect, as it would suggest it had 43 + 13 = 56 neutrons. The statement is false.

Step 2

2 It has 43 protons.

99%

104 rated

Answer

This statement is correct. The atomic number of Technetium (Tc) is indeed 43, which means it has 43 protons.

Step 3

3 It has 99 nucleons.

96%

101 rated

Answer

This statement is true. The atomic mass number is the total number of protons and neutrons in the nucleus. Since the isotope is $^{99}$ Tc, it has a total of 99 nucleons.

97% of Students

Report Improved Results

98% of Students

Recommend to friends

100,000+

Students Supported

1 Million+

Questions answered

Use of the Data Booklet is relevant to this question - CIE - A-Level Chemistry - Question 32 - 2012 - Paper 1

Worked Solution & Example Answer:Use of the Data Booklet is relevant to this question - CIE - A-Level Chemistry - Question 32 - 2012 - Paper 1

1 It has 13 more neutrons than protons.

2 It has 43 protons.

3 It has 99 nucleons.

Join the A-Level students using SimpleStudy...

Other A-Level Chemistry topics to explore