Mass number Notes: Definitions & Explanations PDF | Download eBooks
Study Mass number lecture notes PDF with biology definitions and explanation to study “What is Mass number?”. Study mass number explanation with biology terms to review biology course for online degree programs.
Mass number Definition:
Mass number is the sum of protons plus neutrons in the nucleus of an atom.
Campbell Biology by J.B. Reece, L.A. Urry, M.L. Cain, S.A. Wasserman, P.V. Minorsky, R.B. Jackson
Mass number Notes:
The mass number is also called atomic mass number or nucleon number and is the total number of protons and neutrons in an atomic nucleus. It determines the atomic mass of atoms. The mass number however may be different for each isotope of an element. For example, the most common isotope of carbon is carbon-12 and has 6 protons and 6 neutrons. This is not the same as the atomic number (Z) which denotes the number of protons in a nucleus, and thus uniquely identifies an element. Hence, the difference between the mass number and the atomic number gives the number of neutrons (N) in a given nucleus by N=A-Z.
Keep Learning with Biology Notes
What is Hemophilia?
Hemophilia is a bleeding disorder that slows the blood clotting process. People with this condition experience prolonged bleeding or oozing ...
What are Cytoplasmic determinants?
Cytoplasmic determinants are special molecules or proteins that are present in the cell and play a very important role during ...
What is Evolutionary tree?
An evolutionary tree is also called a phylogenetic tree. It is a diagram that represents evolutionary relationships among organisms. Phylogenetic ...
What is Counter current exchange?
Counter current exchange is the mechanism by which some property of a fluid, such as heat or a chemical substance, ...
What are Functional groups?
A group of atoms that are directly responsible for participating in chemical reactions. A functional group will undergo the same ...
What is Sphincter?
A sphincter is a circular muscle that normally maintains constriction of a natural body passage or orifice and which relaxes ...