2 Fe2O3 (s) → 4 Fe (s) + 3 O2 (s) ∆H = -97.0 kJ/mol Fe2O3, determine the mass of iron produced if the reaction yields 254 kJ of heat energy.

12 is probably the typical age for a first kiss but i think its to young.

You can look it up online and some images should pop up 

Beaker test tube ..i think

Answer: 1s²  2s²  2p⁶explanation: from the periodic table, we can note that the neutral fluorine  has 9 electrons (symbol is shown in the attached image)therefore, the configuration of neutral fluorine  is: 1s²  2s²  2p⁵now, f⁻  means that the neutral fluorine  gained one extra electron. this means that f⁻  has 10 electrons.the extra electron will occupy the 2p level to make it complete.the configuration now  is: 1s²  2s²  2p⁶comparing between both f and f⁻, we can note that f⁻  has now complete orbitals which means that it is more stable than f based on lewis postulatehope this : )