# Question b0a1b

Protons.

#### Explanation:

The atomic number tells the number of positively charged PROTONS in the nucleus of an atom.

or

The atomic number tells the number of positively charged SUBATOMIC PARTICLE in the nucleus of an atom.

(because positively charged proton can be redundant)

Jul 28, 2017

Protons (or just "particles", since it is understandably positively-charged...)

#### Explanation:

The atomic number (symbol $Z$) of an element is the number of protons present in the nucleus of an atom of that element.

The number of neutrons and electrons present in the atom can change without changing the identity of the element (respectively, the new particle would be called an sfcolor(red)("isotope" (change in sfcolor(red)("neutron" number) or an sfcolor(blue)("ion" (change in sfcolor(blue)("electron"# number) of that element).

An element can commonly be notated by the form

Referring to a periodic table, could you tell me which element has the atomic number 38? or 56? or 101? How many protons do each atom of these elements contain?