It can lose 1.
Selenium will gain two electrons and arsenic will gain three electrons
Metals usually lose electrons, this is why many charges are positive.
gain 3
Electrons lose in case of potassium. It looses 1 electron.
Phosphorus wants to gain three electrons to have 8 valence electrons.
1. Rubidium don't gain atoms ! 2. If you think to electrons rubidium loss one electron and becom a cation.
Se will gain electrons
It needs to gain 3 electrons than to lose 5 electrons. So phosphorus has to gain 3 electrons.
In phosphene it gain 4 electrons. Phosphate lose 4 electrons
it will lose 3 electrons
Selenium may lose 2, 4 or 6 electrons and may gain 2 electrons.
It must gain two electrons.
It will lose 2 electrons.
45
Selenium will gain two electrons and arsenic will gain three electrons
Silicon gains 4 electrons.
Si gains 4 electrons.