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en.wikipedia.org/wiki/Atomic_number

The atomic number or proton number (symbol Z) of a chemical element is the ...

www.angelo.edu/faculty/kboudrea/periodic/structure_numbers.htm

In the modern periodic table, the elements are listed in order of increasing atomic number. The atomic number is the number of protons in the nucleus of an atom ...

chem.libretexts.org/Courses/Furman_University/CHM101%3A_Chemistry_and_Global_Awareness_(Gordon)/03%3A_Atoms_and_the_Periodic_Table/3.04%3A_Atomic_Mass_and_Atomic_Number

Jan 23, 2021 ... The atomic number (represented by the letter Z) of an element is the number of protons in the nucleus of each atom of that element. An atom can ...

www.khanacademy.org/science/biology/chemistry--of-life/elements-and-atoms/a/atomic-number-atomic-mass-and-isotopes-article

Atoms of each element contain a characteristic number of protons. In fact, the number of protons determines what atom we are looking at (e.g., all atoms with six ...

www.khanacademy.org/science/ap-chemistry/atoms-compounds-ions-ap/introduction-to-the-atom-ap/v/atomic-number-mass-number-and-isotopes

Well we know that the subscript is the atomic number and the atomic number is equal to the number of protons. So there are six protons in this atom of carbon. And ...

www.britannica.com/science/atomic-number

Atomic number, the number of a chemical element in the periodic system, whereby ... equal to the number of electrons in a neutral atom, is also the atomic number.

courses.lumenlearning.com/introchem/chapter/atomic-number-and-mass-number

Neutral atoms of each element contain an equal number of protons and electrons . · The number of protons determines an element's atomic number and is used to  ...

courses.lumenlearning.com/cheminter/chapter/atomic-number

The atomic number (Z) of an element is the number of protons in the nucleus of each atom of that element. This means that the number of protons is the ...

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

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.

education.jlab.org/glossary/atomicnumber.html

The atomic number is equal to the number of protons in an atom's nucleus. The atomic number determines which element an atom is. For example, any atom ...