Bromine will gain one electron to become Br-
Selenium will gain two electrons and arsenic will gain three electrons
OVER 9000
Selenium can gain 1 electron or loss 2, 4, 6 electrons.
None - it would have to GAIN one.
It can easily gain or lose up to 4 electrons, but at high energies it can lose many more (all the way to 32 leaving just a bare nucleus).
Potassium would lose electrons in all its reactions especially with Bromine.
it gains electrons.
Bromine must gain one electron
In phosphene it gain 4 electrons. Phosphate lose 4 electrons
Some atoms lose electrons, some gain electrons, and some share electrons depending on what elements are involved and what compound is forming.
Boron can lose 3 electrons from its valence shell that is 2 in 2s & 1 in 2p sub-shell, wheras it cannot gain electron b'coz of its electropositive nature & it has less electron affinity.
4
It'll have to gain one to have a stable octet.
Strontium, as a metal, lose electrons forming divalent cations.
Selenium may lose 2, 4 or 6 electrons and may gain 2 electrons.
Selenium will gain two electrons and arsenic will gain three electrons
silicon prefers to share electrons forming covalent bonds