If J3+ Has 20 Electrons And 25 Neutrons, Determine The Mass Number In J2-
Understanding the Basics of Atomic Structure
To solve this problem, we need to understand the basics of atomic structure. The atomic number of an element is the number of protons present in the nucleus of an atom, while the mass number is the total number of protons and neutrons present in the nucleus. The atomic number determines the identity of an element, while the mass number determines the isotope of an element.
Calculating the Mass Number of J3+
Given that J3+ has 20 electrons, we can calculate the number of protons present in the nucleus. Since the number of electrons is equal to the number of protons in a neutral atom, we can assume that the number of protons is also 20. However, since J3+ is a positively charged ion, it has lost 3 electrons, which means it has 3 fewer protons than a neutral atom of the same element. Therefore, the number of protons in J3+ is 20 - 3 = 17.
Calculating the Mass Number of J3+
We are given that J3+ has 25 neutrons. To calculate the mass number, we need to add the number of protons and neutrons. Therefore, the mass number of J3+ is 17 (number of protons) + 25 (number of neutrons) = 42.
Understanding the Relationship Between J3+ and J2-
The problem asks us to determine the mass number of J2-, which is a negatively charged ion of the same element as J3+. Since J2- has gained 1 electron compared to J3+, it has 1 more proton than J3+. Therefore, the number of protons in J2- is 17 + 1 = 18.
Calculating the Mass Number of J2-
We are given that J2- has the same number of neutrons as J3+, which is 25. To calculate the mass number of J2-, we need to add the number of protons and neutrons. Therefore, the mass number of J2- is 18 (number of protons) + 25 (number of neutrons) = 43.
Conclusion
In conclusion, the mass number of J2- is 43.
Frequently Asked Questions
- What is the difference between atomic number and mass number? The atomic number is the number of protons present in the nucleus of an atom, while the mass number is the total number of protons and neutrons present in the nucleus.
- How do you calculate the mass number of an ion? To calculate the mass number of an ion, you need to add the number of protons and neutrons present in the nucleus.
- What is the relationship between J3+ and J2-? J2- is a negatively charged ion of the same element as J3+, and it has 1 more proton than J3+.
Additional Resources
Step-by-Step Solution
- Calculate the number of protons in J3+ by subtracting 3 from the number of electrons.
- Calculate the mass number of J3+ by adding the number of protons and neutrons.
- Determine the number of protons in J2- by adding 1 to the number of protons in J3+.
- Calculate the mass number of J2- by adding the number of protons and neutrons.
Final Answer
The final answer is 43.
Understanding Atomic Structure
Atomic structure is the study of the arrangement of protons, neutrons, and electrons within an atom. The atomic number of an element is the number of protons present in the nucleus of an atom, while the mass number is the total number of protons and neutrons present in the nucleus.
Q: What is the difference between atomic number and mass number?
A: The atomic number is the number of protons present in the nucleus of an atom, while the mass number is the total number of protons and neutrons present in the nucleus.
Q: How do you calculate the mass number of an atom?
A: To calculate the mass number of an atom, you need to add the number of protons and neutrons present in the nucleus.
Q: What is the relationship between atomic number and mass number?
A: The atomic number determines the identity of an element, while the mass number determines the isotope of an element.
Understanding Isotopes
Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons. This means that isotopes have the same atomic number but different mass numbers.
Q: What is an isotope?
A: An isotope is an atom of the same element that has the same number of protons but different numbers of neutrons.
Q: How do you calculate the mass number of an isotope?
A: To calculate the mass number of an isotope, you need to add the number of protons and neutrons present in the nucleus.
Q: What is the difference between isotopes and ions?
A: Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons, while ions are atoms or molecules that have gained or lost electrons.
Understanding Ions
Ions are atoms or molecules that have gained or lost electrons. This means that ions have a different number of protons than a neutral atom of the same element.
Q: What is an ion?
A: An ion is an atom or molecule that has gained or lost electrons.
Q: How do you calculate the mass number of an ion?
A: To calculate the mass number of an ion, you need to add the number of protons and neutrons present in the nucleus.
Q: What is the relationship between ions and isotopes?
A: Ions are atoms or molecules that have gained or lost electrons, while isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons.
Additional Resources
Step-by-Step Solution
- Calculate the number of protons in an atom by adding 1 to the atomic number.
- Calculate the mass number of an atom by adding the number of protons and neutrons.
- Determine the number of protons in an ion by adding or subtracting the number of electrons gained or lost.
- Calculate the mass number of an ion by adding the number of protons and neutrons.
Final Answer
The final answer is that atomic structure, isotopes, and ions are all related to the arrangement of protons, neutrons, and electrons within an atom. Understanding these concepts is essential for chemistry and physics.
Q&A: Common Questions and Answers
- Q: What is the difference between atomic number and mass number? A: The atomic number is the number of protons present in the nucleus of an atom, while the mass number is the total number of protons and neutrons present in the nucleus.
- Q: How do you calculate the mass number of an atom? A: To calculate the mass number of an atom, you need to add the number of protons and neutrons present in the nucleus.
- Q: What is the relationship between atomic number and mass number? A: The atomic number determines the identity of an element, while the mass number determines the isotope of an element.
- Q: What is an isotope? A: An isotope is an atom of the same element that has the same number of protons but different numbers of neutrons.
- Q: How do you calculate the mass number of an isotope? A: To calculate the mass number of an isotope, you need to add the number of protons and neutrons present in the nucleus.
- Q: What is the difference between isotopes and ions? A: Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons, while ions are atoms or molecules that have gained or lost electrons.
- Q: What is an ion? A: An ion is an atom or molecule that has gained or lost electrons.
- Q: How do you calculate the mass number of an ion? A: To calculate the mass number of an ion, you need to add the number of protons and neutrons present in the nucleus.
- Q: What is the relationship between ions and isotopes? A: Ions are atoms or molecules that have gained or lost electrons, while isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons.
Conclusion
In conclusion, understanding atomic structure, isotopes, and ions is essential for chemistry and physics. By calculating the mass number of an atom or ion, you can determine the number of protons and neutrons present in the nucleus.