Beryllium has the electronic configuration 2, 2, so it is likely to lose two electrons, giving it the Helium configuration. However, in practice, beryllium compounds have a high degree of covalent character as the beryllium ion is small and very polarising.
Beryllium will lose 2 electrons to satisfy the octet rule (to fill its outer shell).
Silicon (Si) can gain or lose 4 electrons. It can either gain 4 electrons to have a stable octet configuration or lose 4 electrons to achieve a stable configuration.
Selenium may lose 2, 4 or 6 electrons and may gain 2 electrons.
45
It will lose 2 electrons.
Beryllium will lose 2 electrons to satisfy the octet rule (to fill its outer shell).
Beryllium will lose 2 electrons when forming an ion because it has 4 valence electrons and tends to reach a stable electron configuration by losing electrons to achieve a full outer shell.
Se will gain electrons
Silicon (Si) can gain or lose 4 electrons. It can either gain 4 electrons to have a stable octet configuration or lose 4 electrons to achieve a stable configuration.
it will lose 3 electrons
Selenium may lose 2, 4 or 6 electrons and may gain 2 electrons.
45
It will lose 2 electrons.
Beryllium has two valence electrons.
Silicon gains 4 electrons.
Phosphorus wants to gain three electrons to have 8 valence electrons.
5s orbital