The atomic number of an atom tells you how many protons that atom has. Beryllium's atomic number is 4. That means that, regardless of how many neutrons a given isotope of beryllium may have, it will always have 4 protons.
A beryllium atom without electrical charge.
A neutral atom of Beryllium has 4 electrons. (Its atomic number is 4)
The most important isotope of beryllium - 9Be - has 5 neutrons. The neutral atom of beryllium has 4 electrons.
There are four protons in the nucleus of a beryllium atom.
4 protons.
Beryllium is an atom / element.
Only two electron shells.
Electronic configuration of beryllium: 1s2.2s2.
A beryllium atom has 4 electrons.
An atom of beryllium.
Only two electron shells.