Answer:
Se + 2e- => Se-2
Explanation:
Ions are electrically charged particles, formed due to the gain or loss of electrons by an atom.
There are two types of ions cations and anions. An element that loses their electrons and forms positive ions are cations while metals and element that gains one or more electrons and forms negative ions are anions.
Selenium is an atom with atomic number 34 and represented as Se. The electronic configuration of Se is 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p4. Selenium will gain 2 more electrons to complete it p orbital and form an ion Se-2.
The equation is as below:
Se + 2e- => Se-2
Answer: As the temperature decreases or pressure increases substances move toward the solid state. Solids have a definite shape and a definite volume due to the fact that their particles are relatively close together and are merely vibrating, contrary to popular convention, the particles of a solid are moving.
Answer:
more energy is absorbed when the bonds in the reactants are broken
C6H12O6 + 6O2 >> 6Co2 + 6H2o + energy
