What is stored in the chemical compound

Short Energy is stored in the chemical compound,

Long Energy is stored in many ways when speaking about chemical compounds. First, think about Energy as it is. Generally speaking, it has a kinetic component and a potential one.

Kinetic energy of compounds is measured macroscopically by temperature: their average speed (usually when speaking about gasses) determines some of its properties such as temperature and pressure.

On the other hand, potencial Energy involves different ways in which the molecules can vibrate, rotate, interact with external fields (gravitational, electromagnetical…). It is in this several “modes” that compounds “store” energy.

Now, think about bond formation. If you take an H atom, it can mainly rotate, but its vibration is null, whereas an H2 molecule can rotate AND vibrate. In fact, you could say that it has only one vibrational mode. H2O can vibrate in more ways than H2. It has simmetric and assimetric stretching, it can vary it's angle in what is called bending and several more vibration modes. Why is this important? Because when you have more modes in which to store potencial Energy then your molecule has very different properties, such is its Cv or Cp (Heat Capacity), luminescence properties and so on.

it should be all of them because it asks if you included all of those in your answer

explanation:

assuming that your periodic table has eighteen columns, you should highlight   the four elements in the third column from the left of the table.

neutral atoms of elements after calcium contain d electrons. the energy of d orbitals of a particular main shell lies between the energy of the s and p orbitals of the next main shell. for example, electrons in the have energy higher than those in the orbital while lower than those of the orbital.

by the aufbau principle, electrons fill orbitals one at a time, starting from those of the lowest energy. the orbital is therefore filled right after orbitals and before orbitals.  

potassium has electron configuration and calcium . the s orbital of a main shell holds a maximum of two electrons. the next element would thus have the electron configuration and satisfy the requirements.

a neutral atom of the element contains three electrons on top of the most recent noble gas element. it should thus be placed in the third column of the periodic table. both scandium and yttrium would satisfy the conditions. an aufbau diagram indicates that the 4f orbital is filled before the 5d. however, it appears that exceptions exists for both lanthanum and actinium. neutral atoms of the two d-block elements also demonstrate the and should be highlighted as well.