Phosphorus
The only element in nitrogen family with 16 neutrons is the element Phosphorus (symbol: P). However it is a solid at room temperature and not gas.
No, they are isotopes with the same atomic mass. But they are isotopes of different elements and so are very different from on another. For example nitrogen-16 and nitrogen-14 are isotopes of the same element.
The element that is a member of the nitrogen family (Group 15) and has 16 neutrons is phosphorus. It has an atomic number of 15, meaning it has 15 protons in its nucleus. Adding the 16 neutrons gives phosphorus a mass number of 31.
Fluorine has 7 valence electrons, (9 altogether) and ten neutrons.
Elements are determined by their number of protons. Nitrogen has 7 protons but usually 7 neutrons as well. What you have here is a nitrogen isotope, an element with more or less neutrons than there are protons. Specifically, this is Nitrogen-15.
The main difference between nitrogen-14 and nitrogen-16 is their atomic mass. Nitrogen-14 has 7 protons and 7 neutrons in its nucleus, while nitrogen-16 has 7 protons and 9 neutrons. This results in nitrogen-16 being slightly heavier than nitrogen-14.
It is the 2nd member of nitrogen family, P, phosphorus with 15 protons, 15 electrons and 16 neutrons.
7
Nitrogen
The element with 7 electrons, 7 protons, and 8 neutrons is nitrogen-15 (15N).
Phosphorus and sulfur both have 16 neutrons.
silicon