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en.wikipedia.org/wiki/Mass_number

The mass number (symbol A), also called atomic mass number or nucleon number, is the total ... of nuclei with more neutrons than protons relative to the atomic mass unit scale based on 12C with equal numbers of protons and neutrons.

www.boundless.com/chemistry/textbooks/boundless-chemistry-textbook/atoms-molecules-and-ions-2/the-structure-of-the-atom-34/atomic-number-and-mass-number-201-11406

The atomic number is the number of protons in an element, while the mass ... Neutral atoms of each element contain an equal number of protons and electrons .

socratic.org/questions/what-is-mass-number-equal-to

Oct 1, 2015 ... The total number of nucleons - protons and neutrons - in the nucleus of an atom is called the Mass Number. For example, the most common ...

education.jlab.org/qa/pen_number.html

The atomic number is the number of protons in an atom of an element. In our example ... Atoms must have equal numbers of protons and electrons. In our ...

chemed.chem.purdue.edu/genchem/topicreview/bp/ch6

The number of protons in the nucleus of the atom is equal to the atomic number ( Z). The number of electrons in a neutral atom is equal to the number of protons.

www.enotes.com/homework-help/atomic-number-an-element-equal-number-nucleus-668506

Apr 4, 2016 ... Get an answer for 'The atomic number of an element is equal to the number of _____ in the nucleus.' and find homework help for other Science ...

www.thoughtco.com/atomic-mass-and-mass-number-606105

Apr 25, 2017 ... Atomic number is number of protons, while atomic mass is the number of ... they give a value of atomic mass of hydrogen equal to 1.0079 g/mol.

en.wikibooks.org/wiki/General_Chemistry/Numbers_Used_to_Describe_Atoms

An atom's mass can be found by summing the number of protons and neutrons. By definition, 12 amu equals the atomic mass of ...

www.khanacademy.org/science/chemistry/atomic-structure-and-properties/introduction-to-the-atom/v/atomic-number-mass-number-and-isotopes

How to use the atomic number and the mass number to represent different ... In a neutral atom, the number of protons is equal to the number of electrons, ...

www.chemistry-assignment.com/atomic-number-and-mass-number

ATOMIC NUMBER AND MASS NUMBER. ATOMIC NUMBER. The atomic number of an element is equal to the number of protons in the nucleus of its atom.