The elementary particles of an atom

Exercise 3

    

The following table is about an atom or an ion. Look at your periodic table in order to complete it:

$s$ $n_p$ $m$ $q$ $n_e$ $n_n$

$s$: Symbol
$n_p$: Number of protons $m$: Mass in atomic mass units $q$: Charge in electrons $n_e$: Number of electrons $n_n$: Number of neutrons