(Example) A calcium atom loses two electrons Ca2+ calcium A potassium atom loses one electron K+ Potassium ion

A zinc atom loses two electrons Zn2+ Zinc ion
A barium atom loses two electrons

Write the symbol and name for the anion formed when

(Example) A oxygen atom gains two electrons O2- oxide

A fluorine atom gains one electron

A sulfur atom gains two electrons
A nitrogen atom gains three electrons

i believe it is 40–40–20%

explanation:

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.

it should have an internal chamber and two thermometers sticking out of the top. the internal chamber will also be closed off from the outside.

the answer is c i took the test