It will lose 2 to form Sr2+
Strontium, as a metal, lose electrons forming divalent cations.
5s orbital
Selenium may lose 2, 4 or 6 electrons and may gain 2 electrons.
In forming compounds, atoms are engaged in either gaining or losing electrons. They may also share electrons, but that is also a form of gaining or losing electrons.
It should lose two electrons
Strontium, as a metal, lose electrons forming divalent cations.
You wouldn't expect strontium to gain electrons in a chemical change.
5s orbital
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.
Selenium may lose 2, 4 or 6 electrons and may gain 2 electrons.
Strontium lose electrons.
Selenium will gain two electrons and arsenic will gain three electrons
silicon prefers to share electrons forming covalent bonds
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
because nonmetals gain electrons in ionic bonds and metals lose electrons in ionic bonds(oxidize).