How would an electron shell model of an oxygen atom (o) appear after the atom has formed chemical bonds?

a. it would have six electrons in the outermost shell.
b. it would have six electrons in the innermost shell.
c. it would have eight electrons in the outermost shell.
d. it would have eight electrons in the innermost shell.

oxygen atomic number is 8.

electron configuration of O is 2,6

therefore O has 6 valence electrons. valence electrons are electrons in the outermost shell that are involved in chemical bonds

atoms to become stable should fulfill the octet rule. This is where the outermost shell should have 8 electrons

so atoms with incompletely filled outer shells take part in chemical bonds to gain a complete octet and to become stable

So O too after forming a chemical bond would have 8 electrons in the outermost shell.

correct answer is

c. It would have eight electrons in the outermost shell.

< > according to newton's third law of motion, forces always act in equal but opposite pairs. another way of saying this is for every action, there is an equal but opposite reaction.< >

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.