What happens to the atomic radius between element two and three? What causes this change? Is the same relationship observed between other elements? Explain.

increased stability in the completion of fluorine's outer shell.

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.

i dont know the answe

the answer your looking for is c).