They are lost. If it has a plus sign beside the ion charge, that means the atom loses electrons. But if it has a negative sign for the ion charge, that means that the atom gains electrons.
Since Selenium is a Chalcogen (meaning it's in group 6A on the Periodic Table), it gains 2 electrons to form an ion with a charge of -2.
Oxygen is in group 6, and so it has 6 valence electrons. It needs to more to make an octet, so it will GAIN TWO electrons, and become negative 2, i.e. O^2-.
the atomic no of oxygen is 8 to reach the nearest noble gas electronic configuration it excepts 2 electrons and becomes isoelectronic to Neon.
Strontium (Sr) typically loses two electrons to achieve a stable electron configuration. This occurs because strontium is an alkaline earth metal located in Group 2 of the periodic table, and it readily forms a +2 cation (Sr²⁺) by losing its two outermost electrons. Therefore, strontium loses two electrons during chemical reactions.
It should loose 2 electrons to become a noble gas.
Since Selenium is a Chalcogen (meaning it's in group 6A on the Periodic Table), it gains 2 electrons to form an ion with a charge of -2.
+2 implies that 2 electrons are lost by the element. -2 implies that 2 electrons are gained by the element
+2 implies that 2 electrons are lost by the element. -2 implies that 2 electrons are gained by the element
Oxidation is the loss of electrons. Reduction is the gain of electrons. The oxidizing agent is reduced. The reducing agent is oxidized. Cu goes from 0 to +2, it lost electrons S went from +6 to +4, it gained electrons I went from 0 to +5, it lost electrons N went from +5 to +4, it gained electrons.
Oxygen is in group 6, and so it has 6 valence electrons. It needs to more to make an octet, so it will GAIN TWO electrons, and become negative 2, i.e. O^2-.
the atomic no of oxygen is 8 to reach the nearest noble gas electronic configuration it excepts 2 electrons and becomes isoelectronic to Neon.
Mg 2.8.2 likes to lose 2 electrons to become Mg 2.8, when it loses them it becomes an Mg 2+ ion.
An electron can be gained or lost from an atom for two reasons: 1. A random number of atoms can be close together will have electrons bumping into each other. Since all electrons have a negative charge, they will have magnetic effects on one another, and will push eachother of the outer shell of their atoms and into different ones. 2.Two or more atoms can bond together so that both atoms in turn have a balanced number of electrons.
loses 2 electrons to form a calcium ion with 2+ charge
The increase in oxidation number indicates loss of electrons, while a decrease indicates gain of electrons. For example, if an atom's oxidation number increases from +2 to +4 in a reaction, it has lost two electrons. Conversely, if the oxidation number decreases from +4 to +2, it has gained two electrons.
surely i don't know sodium atom which can be gained 2 electrons but anyway i thought the answer is Na+2
It should loose 2 electrons to become a noble gas.