How many neutrons does n15 have

In an isotope, which part of the atom changes? What are some examples of isotope notations? What are some common mistakes students make with isotope notation? What is an isotope? What does the superscript of an isotope notation mean? How many neutrons does Uranium have if it has 92 protons? What is the difference between isotope notation and hyphen notation? A neutral nitrogen atom will also have 7 electrons.

Group 15 : The Nitrogen Family. The nitrogen family includes the following compounds: nitrogen N , phosphorus P , arsenic As , antimony Sb , and bismuth Bi.

All Group 15 elements have the electron configuration ns 2 np 3 in their outer shell, where n is the principal quantum number. Isotopes are atoms that have the same number of protons but different numbers of neutrons in the nucleus.

You know that nitrogen has 7 protons in the nucleus because it is an isotope of nitrogen , which has an atomic number equal to 7. The mass number of an isotope is added to the name of the isotope. The number of electrons in a neutral atom is equal to the number of protons. The mass number of the atom M is equal to the sum of the number of protons and neutrons in the nucleus.

The number of neutrons is equal to the difference between the mass number of the atom M and the atomic number Z. However, we already know that there are 7 protons. Therefore, there must be 8 neutrons in the nucleus to add up to Table 3. Some isotopes of nitrogen are unstable. They give out radiation to become more stable; we say they are radioactive. Nitrogen and nitrogen are both stable isotopes of nitrogen. However, the other 5 isotopes are all unstable. Nitrogen and nitrogen will decay by beta plus emission and nitrogen, nitrogen and nitrogen decay by beta minus emission.

We can plot a graph of stable isotopes. The atomic number , Z, is on the x-axis and the number of neutrons N is on the y-axis. If we got a straight line all the way, then this would tell us that the stable isotopes have the same number of neutrons as protons.

However, this is not the case. The line curves upwards. Stable isotopes of the heavier elements top right of the graph have more neutrons than protons. For example, Gold is stable. It contains 79 protons and neutrons. The neutrons in a nucleus can be thought of as acting as a kind of glue to hold the nucleus together. The positively charged protons are in a very confined space but would rather not be, due to the fact that they repel each other.

What is an isotope? What does the superscript of an isotope notation mean? How many neutrons does Uranium have if it has 92 protons? What is the difference between isotope notation and hyphen notation? See all questions in Isotope Notation.