Which is true about stable isotopes? (1 point)
• Isotopes with more neutrons than protons are always stable.
* A stable nucleus has a similar number of protons and neutrons.
• Isotopes that are naturally occurring in nature are always unstable.
• Isotopes are always unstable because they are radioactive.
A stable nucleus has a similar number of protons and neutrons.
A stable nucleus has a similar number of protons and neutrons.
To determine which statement is true about stable isotopes, we need to understand the concept of stable isotopes and how they behave.
First, let's define isotopes. Isotopes are different forms of an element that have the same number of protons but differ in the number of neutrons in their nucleus. These different isotopes of an element can have different masses.
Now, let's analyze each statement:
1. Isotopes with more neutrons than protons are always stable.
This statement is not true. The stability of an isotope is not solely determined by the number of neutrons and protons it possesses. While the ratio of neutrons to protons can have an influence on stability, it is not the only factor.
2. A stable nucleus has a similar number of protons and neutrons.
This statement is partially true. In general, stable isotopes tend to have a balanced ratio of protons and neutrons in their nuclei. However, there are exceptions to this rule. Some stable isotopes have slightly more neutrons than protons, and vice versa. So while a similar number of protons and neutrons is common for stable isotopes, it is not always the case.
3. Isotopes that are naturally occurring in nature are always unstable.
This statement is not true. There are many naturally occurring isotopes that are stable. For example, carbon-12 (12C), which is the most abundant isotope of carbon, is stable. Many other elements, like oxygen, nitrogen, and silicon, also have naturally occurring stable isotopes.
4. Isotopes are always unstable because they are radioactive.
This statement is not true. Radioactive isotopes are unstable and undergo radioactive decay, emitting radiation in the process. However, not all isotopes are radioactive. There are many stable isotopes that do not undergo radioactive decay.
Based on the analysis, the most accurate statement is number 2: A stable nucleus has a similar number of protons and neutrons. While not all stable isotopes have an equal number of protons and neutrons, they tend to have a balanced ratio.