Thoughts on my Term 1 Test Performance.

To improve ourselves we must always review on ourself and what we have done. To do better for the upcoming next term, I would like to comment about my performance in this Term 1 Test 1. Scoring 34/40, or 85 marks, I am still behind many of my fellow classmates who scored around 35-38. In fact, around half of the class has passed this test with flying colors,and this indeed let me feel kind of left out and lagging. Anyway, it has been generally thought that this test was rather easy, and as long as you put in some effort, you will definitely soar high in this test. I think that the reason behind this score was that I had not put enough effort in my Science revision this term, largely due to the lack of time. I am rather weak in Maths, and had to spend more time on it as the test was on the day after the Science test. Thus I did not really had a comprehensive revision, and besides, I thought that I was rather relax on those few days before the tests. Luckily, I had prepared for my Science a few months ago., and have largely based on my memory and impression during the test.And that was when I did not memorise much content.Thus, I would say that my achievement this time round contained much of  the element of luck.Maybe I had to work on my management of my time. But looking at the score of my friends, I realized that importance of perseverance and diligence which would always prove worthwhile.Given the status quo I was in, I am really satisfied that I had obtained this result. However, I promise to strive harder for next term for greater heights and would do my best. Most importantly, out of all this test, I have realized what are the aspects I am weak in so as to allow me to upgrade myself, not the score of it.

Formation of Xenon Flouride

Regarding to the formation of compounds and bonds, I have discovered a interesting,additional fact and would like to share it here,which I also did it for my ACE too.The compound name xenon flouride certainly looks difficult but cool. Let us understand it then.As we know, xenon is an unreactive, stable noble gas,with the electronic configuration of 2.8.8, while flourine is a halogen with the configuration of 2.7. It is widely regarded that noble gases will not combine with other elements to form compounds. Why can this compound still form a covalent compound with the electronic configuration of XeF2(xenon flouride can still exist in many other forms). First of all, it would be due to the structure of the xenon atom. As xenon is located at the foot of its group, it has a large number of shells and are thus heavier than the lighter ones.Hence, the outermost electrons experience a shielding effect from the inner electrons that makes them more easily ionised, since they are less strongly attracted to the positively-charged nucleus. This results in an ionization energy low enough to form stable compounds with the most electronegative elements, fluorine and oxygen, and even with less electronegative elements such as nitrogen and carbon under certain circumstances. Ionisation energy is the force or energy needed for an atom to give up and remove its electrons. Electronegativity would then mean an atom's ability or tendency to attract electrons to itself to form a anion. Each element's has its own electronegativity represented by a value. It is classified that elements that have the electronegativity difference of 0.2-0.5 would form non-polar covalent bonds(where there is equal sharing of electrons), 0.5-1.6(polar covalent bonds,unequal sharing) and above which will belong to ionic bonds. Xenon's electronegativity is 2.60, while flourine's is 3.98. The difference would thus mean a non-polar covalent bond formed. For those who don't quite understand what I am discussing about, you can refer to the electronegativity table online. Nonetheless, after all this, you will find this extremely interesting.