- #1
axer
- 35
- 4
Homework Statement
An isotope of which element has a mass number of 111 and has 5 more neutrons
A- Antimonu
B- Cadmium
C- Iodine
D- Tin
E- Xenon
Homework Equations
The Attempt at a Solution
I don't know where to start
Thank you its C lol Thanks got it..Scott said:It means 5 more neutrons than protons.
The atomic numbers of the possible answers are 51 (Antimony, Sb), 48 (Cd), 53 (I), 50 (Sn), and 54 (Xe). Antimony-111 has a half-life of 75 seconds. Cadmium-111 is stable. Iodine-111 has a half life of 2.5 seconds. Tin-111 has a half-life of 35 minutes. Xenon-111 has a half-life of 0.74 seconds. So all of the possible answers have a possible mass number of 111.epenguin said:You give no reasoning but I think your answer has to be wrong on any possible guess of what the question is.
To find the number of protons in an isotope, you can subtract the number of neutrons from the mass number. The mass number represents the total number of protons and neutrons in an atom. Therefore, if you know the number of neutrons, you can find the number of protons by subtracting it from the mass number.
Yes, the atomic number of an element is equal to the number of protons in its nucleus. Since the mass number is the sum of protons and neutrons, subtracting the number of neutrons will give you the atomic number.
Yes, isotopes are atoms of the same element with different numbers of neutrons. This means that they will have the same atomic number (number of protons) but different mass numbers depending on the number of neutrons in their nuclei.
To identify an isotope, you will need to know its mass number and atomic number. The atomic number will tell you which element the isotope belongs to, while the mass number and number of neutrons will differentiate it from other isotopes of the same element.
Yes, the stability of an isotope is determined by the ratio of protons to neutrons in its nucleus. Generally, isotopes with a lower neutron-to-proton ratio are more stable. However, there are exceptions to this rule and other factors can also affect an isotope's stability.