Respuesta :
Answer: Beryllium
Explanation: Beryllium has atomic number 4, which means it has 4 protons in its nucleus, and 4 electrons in its orbitals. The only stable isotope of Beryllium has 5 neutrons.
Answer: Beryllium
Explanation: Beryllium has atomic number 4, which means it has 4 protons in its nucleus, and 4 electrons in its orbitals. The only stable isotope of Beryllium has 5 neutrons.