1. Determine the number of protons, neutrons, and
electrons in the following isotopes that are used in
medical diagnoses:
(a) atomic number 9, mass number 18, charge of 1-
(b) atomic number 43, mass number 99, charge of
7+
(c) atomic number 53, atomic mass number 131,
charge of 1-
(d) atomic number 81, atomic mass number 201,
charge of 1+
Answers
Answer:
- a) protons - 9
- electrons-10
- Neutrons-9
- b) protons- 43
- Electrons-36
- Neutrons- 56
- c) protons- 53
- Electrons- 54
- Neutrons- 78
- d) protons- 81
- Electrons- 80
- Neutrons- 120
Answer:
(a) Eletron = 10
Proton = 9
Neutron = 9
(b) Eletron = 36
Proton = 43
Neutron = 56
(c) Eletron = 54
Proton = 53
Neutron = 78
(d) Eletron = 80
Proton = 81
Neutron = 120
Explanation:
(a) Number of the proton is equivalent to the atomic number. Therefore,
Number of proton = 9
Number of neutrons = Mass number - Number of protons
Number of neutrons = 18 - 9
Number of neutrons = 9
Atom has a negative 1 charge therefore, it has accepted one electron.
Number of electron = 9 + 1
Number of electron = 10
(b) Number of the proton is equivalent to the atomic number. Therefore,
Number of proton = 43
Number of neutrons = Mass number - Number of protons
Number of neutrons = 99 - 43
Number of neutrons = 56
Atom has a positive 7 charge therefore, it has donated 7 electrons.
Number of electron = 43 - 7
Number of electron = 36
(c) Number of the proton is equivalent to the atomic number. Therefore,
Number of proton = 53
Number of neutrons = Mass number - Number of protons
Number of neutrons = 131 - 53
Number of neutrons = 78
Atom has a negative 1 charge therefore, it has accepted one electron.
Number of electron = 53 + 1
Number of electron = 54
(d) Number of the proton is equivalent to the atomic number. Therefore,
Number of proton = 81
Number of neutrons = Mass number - Number of protons
Number of neutrons = 201 - 81
Number of neutrons = 120
Atom has a positive 1 charge therefore, it has donated one electron.
Number of electron = 81 - 1
Number of electron = 80