# Na Atom

An atom is the smallest unit of matter that retains all of the chemical properties of an element. Atoms combine to form molecules, which then interact to form solids, gases, or liquids. For example, water is composed of hydrogen and oxygen atoms that have combined to form water molecules. The magnitude of the spin-orbit interaction has the form μ z B = μ B S z L z.In the case of the sodium doublet, the difference in energy for the 3p 3/2 and 3p 1/2 comes from a change of 1 unit in the spin orientation with the orbital part presumed to be the same.

1 mole is equal to 6.0221415E+23 atom. Note that rounding errors may occur, so always check the results. Use this page to learn how to convert between moles and atoms. Type in your own numbers in the form to convert the units! ›› Quick conversion chart of mole to atom. 1 mole to atom = 6.0221415E+23 atom. 2 mole to atom = 1.2044283E+24 atom.

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### The sodium atom contains 11 electrons, 11 protons, and 12 neutrons. What is the mass number of sodium?

#### Explanation:

The mass number is the sum of the neutrons and protons in an atom.
So 11 protons + 12 neutrons= 23

We have the ${'}^{23} N a$ isotope.........i.e. $' m a s s \nu m b e r ' = 23$.

## Na Number Of Atoms

A sneakier question would have asked:

#'an atom contains 11 protons, and 12 neutrons; how may electrons'##'in the neutral atom; what is the atom?'#.

The sum of neutrons and protons, the massive nuclear particles, gives the mass number, with which we often label the elemental symbol as a left hand superscript. But the number of $' \nu c \underline{a} r p r o \to n s '$, i.e. $Z$, UNEQUIVOCALLY identifies the atom; $Z = 11$ for sodium, $Z = 10$ for neon; $Z = 12$ for magnesium.

## Na Atom Picture

It is not too difficult to incorporate these ideas into your understanding, and if you have a Periodic Table in front of you (and you should have one NOW!) these problems are straightforward.