Comments on friends!! :)

On Cindy(02)-great effort! the points are very detail and image are very clear and easy to understand too! I think it is very good to highlight the keywords, i should also do so the next time round! For question 2 and 3 she even include the point that "losing 6 electron is difficult...& gaining 7 elecrons is difficult... respectively.", which very few people do so. I think it is good that she include this point which make us understand even clearer. The blogskin is very nice! you link up the people, i should do so soon!


On janis(09)-She put in effort doing it too! information detail as well, pictures are very clear and useful! It is good that she search for images, however she should acknowledge the source next time round. For question 2, i think she never include the blacket and put(+) charge. For question 3,she should also include the atomic structure of sulfur atom and sulfide ion, it should be sulfide ion instead of sulfur ion. I think maybe next time font can be more clearer and bigger so it will be easier to read! To conclude, she did well too!


On Jieen(13)-great effort as well! nice answer! it is easy to understand and pictures are very clear too! i have difficulties finding her mistake. i think the words can be bigger next time so it will be easier to read! nice and peaceful song that make me feel like continue reading your blog! is good that you link up the people too!

A wonderful day at jurong central park!

See i am the tallest!! :) love them all!<3

1. What does an atom looks like? What are the sub-atomic particles inside it?

The atom is the smallest foundation unit or particle of an element that can exist. Atoms are made up of 3 types of particles electrons, protons and neutrons. These particles have different properties. Electrons are tiny and light particles that have a negative electrical charge (-). Protons are much larger and heavier than electrons and have a positive charge (+). Neutrons are large and heavy like protons; however neutrons have no electrical charge. Each atom is made up of a combination of these particles. Atoms are neutral because all the no. of protons are equal to the no. of electrons.

The centre of an atom is known as a nucleus. Protons and neutrons are the subatomic particles found inside the nucleus.

Each shell can contain only a fixed number of electrons. The first shell can only hold 2 electrons while the second and third shell can only hold 8 electrons.

2.Draw the atomic structure of a sodium atom and a sodium ion....explain why you draw it this way.

Sodium atom (2.8.1) is a metal because it loss 1 electron to become sodium ion to complete the valance shells to make it stable.

3. Draw the atomic structure of a sulfur atom and a sulfide ion....explain why you draw it this way.

Sulfide atom (2.8.6) is a non-metal because it will gain 2 electrons to become sulfide ion to complete the whole shell, to make it stable.

4. Chlorine-35 atom and Chlorine-37 atom are called isotopes...Use these two examples to explain what is 'isotopes'.

Different atoms of the same element which have the same number of protons but different number of neutrons, is known as isotopes.
Chloride-35 have 17 protons and (35−17=) 18 neutrons. While chloride-37 have 17 protons and (37−17=) 20 neutrons. They have the same number of protons (17p) but different number of neutrons (18 and 20 respectively). Therefore they are isotopes.

5. Sodium is a metal and sulfur is a non-metal....why we classify them this way??
Sodium (2.8.1) is a metal because it loss 1 electron to complete the valance shells to make it stable and it is in group (I). While sulfur (2.8.6) is a non-metal because it will gain 2 electrons to complete the whole shell to make it stable and it is in group (VI).
In the periodic table, Metals are generally in the groups(I),(II),(III) while non-metals are generally in the groups(IV),(V),(VI),(VII),(VIII).