Aleen (27)
Her answers are very detailed and informative. She also provided a lot of pictures for better understanding. It was very useful for her to put the list of topics we learnt on her blog. She once put 'S' for Sodium atom instead of 'Na', I told her about that and she changed her answers immediately, which shows her concern for her answers. I think it would be better if she summarise her answers or else it would be too lengthy.

Yihui (22)
Blog design is simple yet nice. The pictures of the drawings are kind of blur. From question 3 to 5 onwards, she should increase the size of her fonts, the words are just too small for anyone too read. Also for question 5, she should also state the phyiscal properties of the classification of metals.

Clarence (32)
His blog is quite well done esp the design. The electron's mass is 1/1840 instead of 1/1836 according to the textbook (He has changed it). I can't seem to see the picture for question 1, he should change the picture or remove it. I liked the way he answered question 5, because other than saying the chemical/physical properties, he said that the metals, transition metals and non-metals from which group. That's also another way of classifying them. He also gave the definition of Isotopes even though the question didn't require it.


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JunWei (38)
Once I entered his blog, I saw snail and bee flying around. And that '`FLYWITHYOUUU' seems to distract me a lot. It would be better if he changed it to '`FLYWITHMEEE' sounds more original. When I scrolled right, I even saw a dog ! 妈呀, he 14 years old or 4 years old? He should find a blogskin more suitable for his age. Other than that, his information provided are pretty useful and understanding.

CNY'2011 outing with 2E5'10 <3

Seoul Garden ! :>

Vietnam trip'09 with 2E5'10 awesome people \m/

Best picture must always be saved for the last ;)

Look at Oh Jun Wei, he looked like some kind of uncle. The rest of them looked like small kids ><

http://www.youtube.com/watch?v=T6UujimddEc&feature=player_embedded

ENJOY ~ !

#1 What does an atom looks like? What are the sub-atomic particles inside it.....(talk about electrons, neutrons, protons, electron shells, nucleus....)

An atom looks like a nucleus surrounded by an orbital electron shell.
An atom consists of sub-atomic particles such as:

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Protons

-carries one positive electric charge (+1)

-has a relative mass of 1

-is represented by the symbol, p

Neutrons

-carries no electric charge

-has a relative mass of 1

-is represented by the symbol, n

Electrons

-carries one negative electric charge (-1)

-has a relative mass of 1/1840 (negligible)

-is represented by a symbol, e

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These particles are even smaller than the atoms themselves. They are called sub-atomic particles.

The protons and neutrons are found in the nucleus of the atom. These two particles that make up the nucleus are known as nucleons.

Electrons move rapidly around the nucleus in definite energy levels or electron shells.

http://www.antonine-education.co.uk/physics_as/module_1/topic_1/Atom_1.gif

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

The sodium atom is drawn this way as its electronic configuration is (2.8.1) only having one electron on its last shell. The sodium ion however is stable and has lost its one electron on the outermost shell causing its electronic configuration to be (2.8) only.

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

The sulfur atom is drawn this way as its electronic configuration is (2.8.6) having six electrons on its last shell. The sulfur ion however is stable and has gained 2 electrons on the outermost shell causing its electronic configuration to be (2.8.8).

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

Chlorine-35 has 35 as its nucleon number. Therefore, (35-17=18) it has 17 protons and 18 neutrons

Chlorine-37 has 37 as its nucleon number. Therefore, (37-17=20) it has 17 protons and 20 neutrons.

Isotopes are different atoms of the same element which have the same number of protons but different number of neutrons.
Chlorine in this case has 18 and 20 neutrons respectively. As chlorine has two different number of neutrons but same number of protons, thus, they are called isotopes.

http://alexteoh.com/Atomic%20Structure.htm

#5 Sodium is a metal and sulfur is a non-metal....why we classify them this way??
Physical properties
Metal conduct electricity well while non-metal is a poor conductor of electricity

Chemical properties
Sodium (2.8.1) is a metal because it will lose 1 electron to complete the valence shell.
Sulfur (2.8.6) is a non-metal because it will gain 2 electrons to complete the valence shell