Obligation is ones responsibility to do any certain task. The Presidents obligation to the United States of America is to keep standard of living as high as possible in his country and to protect it from war and economic failure.

With the bohr diagram one cans see how many available electrons can be "traded" by the element thus showing its level of reactivity. 

The answer is 64 grams per mole. We know that Oxygen has an atomic mass of 16. And since there are two of them we multiply that number by two to get 32. And sulfur also has an atomic mass of 32 and there is only one of them so we simply add 32 and … Read more

(Na)2 O + H2O--> 2NaOH. All you have to is write the equation and then notice that you have 2 Na on the left. Therefore you apply a 2 towards SOdium hydroxide and notice it balances the equation. 2 Na's. 2 O's. 2 H's on each side.

Octet rule: Atoms can have at most 8 electrons in their outermost energy level. In order to reach  stability, atoms will gain or lose electrons to achieve a full outermost energy level (valence). refer to periodic tableperiod 1 will gain 1 electronperiod 2 will gain 2 electronperiod 13 will gain 3 electronsperiod 14 will gain or lose … Read more

Particles are always vibrating, the only difference is if they are part of a liquid solid or gas. In a liquid, the particles have much room to vibrate, and even more in a gas, however, in a solid, the space is minimal, so the particles vibrate and hit against each other. Even though a solid … Read more