This is a chemical element. You can find the how many electron in a single atom by using a Periodic Table.
Selenium may lose 2, 4 or 6 electrons and may gain 2 electrons.
Oxygen should gain 2 electrons to achieve noble gas configuration
It will lose 2 to form Sr2+
Three. In fact, any element in the same column of the periodic table as nitrogen will also gain three electrons when forming an ion.
Selenium gains two electrons to achieve a stable electron configuration, usually by forming ionic compounds in which it takes on a -2 charge.
Nitrogen gains 3 electrons, oxygen gains 2 electrons, sulfur gains 2 electrons, and bromine gains 1 electron when forming ions.
Sulfur typically gains 2 electrons to form an ion with a -2 charge.
Atoms in the oxygen family can gain or share two electrons in order to achieve an octet of electrons.
Selenium may lose 2, 4 or 6 electrons and may gain 2 electrons.
Under the usual chemical conditions oxygen gains 2 electrons to form ions. However when ionized by electrical discharges or other high energy physical processes oxygen can lose any number of electrons to form ions (even all of its electrons).
One, and only one.
Oxygen tends to gain two electrons to complete its "octet", making it O2- with the electron configuration 1s22s22p6
Krypton can gain a maximum of 2 electrons to achieve a stable octet configuration, forming the Kryptonide anion. It does not typically lose electrons.
Oxygen will tend to gain 2 electrons to form an ion with a charge of -2. This is because oxygen has 6 valence electrons and is looking to achieve a stable octet configuration like the nearest noble gas, which has 8 valence electrons.
Under the usual chemical conditions oxygen gains 2 electrons to form ions. However when ionized by electrical discharges or other high energy physical processes oxygen can lose any number of electrons to form ions (even all of its electrons).
Selenium typically gains two electrons to achieve a stable electron configuration, forming the Se2- ion. Arsenic typically loses three electrons to achieve a Noble Gas electron configuration and forms the As3+ ion.
Oxygen should gain 2 electrons to achieve noble gas configuration