The mass of an atom is nearly all because of the proloads and also neutrons in the nucleus. The atomic mass number is the number of protons added to the number of neutrons and also is provided the symbol A. For this atom of lithium, A equals 6.

You are watching: Nitrogen has an atomic number of 7

The variety of proloads in the nucleus of an atom is called the atomic number. It has actually the symbol Z. The atomic number of lithium is 3.

We can show the atomic mass number and the atomic number with the symbol for the element.

Structure of nucleus graphicPicture 2.4 Showing the atomic number and mass number of an atom. Notice that they come prior to the symbol. A is at the height and also Z is at the bottom.Symbols for atomsNitrogen has an atomic number of 7 (Z=7) because it has 7 prolots in its nucleus. Some nitrogen atoms have an atomic mass variety of 15 (A=15).

A is the variety of neutrons plus protons in the nucleus.However before, we already understand that tright here are 7 prolots. Thus, tright here must be 8 neutrons in the nucleus to add as much as 15.

Neutrons and also isotopesThe nucleus of every nitrogen atom has actually 7 ptoloads. However, the variety of neutrons can differ. This gives climb to different isotopes (check out page 9). Several of these isotopes will be radioactive.

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navigating barQuestion 7Look at the icons below. In each situation, decide on the lacking indevelopment and kind it into the space.
a) carbon 14i. atomic numberii. variety of protonsiii. number of neutronsb) oxygen 17i. atomic mass numberiii. variety of neutronsc) helium 4i. Aii. Ziii. number of neutrons