It can't. Krypton is a noble gas, which means that all of its valence shells are filled with electrons. It doesn't want to be overfilled, nor does it want to be missing any. Though there are laboratory experiments making some types of ions, but it is very difficult and quick. You won't be seeing any ions of krypton made naturally.
It is one of the noble gases, therefore it has no charge. Kr
Krypton is neither Cation or Anion because it is a Noble Gas and is neutral.
Krypton is a noble gas and generally does not gain or lose electrons.
Neither. 'Tis a noble gas.
Selenium will gain two electrons and arsenic will gain three electrons
None - it would have to GAIN one.
OVER 9000
Selenium can gain 1 electron or loss 2, 4, 6 electrons.
Bromine will gain one electron to become Br-
None, it is a noble gas.
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.
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
It will lose 2 to form Sr2+
Beryllium would tend to lose its two electrons when forming a bond because it is easier to lose its two valence electrons rather than gain an additional five in order to obtain a full outer shell.
OVER 9000
None - it would have to GAIN one.
because nonmetals gain electrons in ionic bonds and metals lose electrons in ionic bonds(oxidize).