Comments on mis amigos~

Xue Li (07) :
I like the way she answer, it is clear and easy to understand . However I can't seems to find any acknowledgment for the pictures she posted. Her blog is really pretty and the font seems clear. She place good music too.

Aleen (27) :
Her answers are very detailed and good. Not quite simple to understand but I can still make it. A lot of pictures for better understanding is what i like the most. Her blog is cool however the fonts a little small. I can see great effort put in it.

Agnes (14) :
Her answers are short and simple yet able to understand; just the way I like it.I like the table she posted for her answer, really useful. Her blog is really nice, especially the Japanese words.

5. Sodium is a metal and sulfur is a non-metal....why we classify them this way??

Sodium is a metal as it have 1 electron to complete it's valance shell, conduct electricity and have lower electronegativities . Electronegativity is a measure of the ability of an atom in a molecule to draw bonding electrons to itself.





















Electronegativity information and above picture are from :
http://hyperphysics.phy-astr.gsu.edu/hbase/pertab/metal.html
http://hyperphysics.phy-astr.gsu.edu/hbase/chemical/bondd.html#c3

Sulfur is a non-metal as it gain 2 electrons to complete it's valance shell, does not conduct electricity and have higher electronegativities.

Group (I), (II) and (III) are metals while Group (IV), (V), (VI) , (VII), (VIII) and Group 0 are non-metal. Sodium fall on Group (I) while sulfur fall on (VI).


















Above picture is from :
http://hyperphysics.phy-astr.gsu.edu/hbase/pertab/metal.html

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

What is "isotopes"?

Isotopes is different atoms of the same element which have the same number of protons but different number of neutrons. An example is chlorine-35 and chlorine-37. Chlorine-35 have 17 protons and 18 neutrons, while chlorine-37 have 17 protons and 20 neutrons. Both chlorine-35 and chlorine-37 have the same number of protons (17) while different number of neutrons. Chlorine-35 has 18 neutrons while chlorine-38 has 20 neutrons. Thus they are isotopes.

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

Atomic structure of sulfur atom :














Atomic structure of sulfide ion :














Explanation :
Sulfur atom have 16 electrons ,thus we have to draw 3 rings around the word"S" and the "x" on each of the ring. The "S" which is the word at the center of the ring is the atom/element.The rings represents electron shells and the "x" represents the electrons. The first ring are only allowed to have a maximum of 2 electrons. While the others can be drawn up to 8 maximum. Sodium atom have 16 electrons, which means we have to draw 3 rings and 16 "x" . Easier explanation is by following the electronic configuration. Sulfur atom electronic configuration is [2.8.6]. The first number represent the first ring, second number is the second ring. The number represent the number of electron on that ring.
Sulfide ion have 18 electrons, thus we have to draw 3 rings and 18 "x". Another word is 3 electron shells and 18 electrons. The reason why it only have 18 electrons because it is to make it stable. To be stable, it's valance shell have to reach the maximum number of electron. For sulfide ion to be stable, it need to gain 2 electron.

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

Atomic structure of a sodium atom :

Atomic structure of a sodium ion :
Explanation :
Sodium atom have 11 electrons ,thus we have to draw 3 rings around the word"Na" and the "x" on each of the ring. The "Na" which is the word at the center of the ring is the atom/element.The rings represents electron shells and the "x" represents the electrons. The first ring are only allowed to have a maximum of 2 electrons. While the others can be drawn up to 8 maximum. Sodium atom have 11 electrons, which means we have to draw 3 rings and 11 "x" . Easier explanation is by following the electronic configuration. Sodium atom electronic configuration is [2.8.1]. The first number represent the first ring, second number is the second ring. The number represent the number of electron on that ring.
Sodium ion have 10 electrons, thus we have to draw 2 rings and 10 "x". Another word is 3 electron shells and 10 electrons. The reason why it only have 10 electrons because it is to make it stable. To be stable, it's valance shell have to reach the maximum number of electron. For sodium ion to be stable, it need to lose 1 electron.

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 look like this :


















Picture adapt from :
http://www.clker.com/cliparts/3/8/9/1/1195436863389690204logomancer_Atom_Model.svg.med.png

The sub-atomic particles inside it is protons ,neutrons and electrons.
Protons and neutrons are found inside nucleus. Electrons are found on
electron shell. Protons and electrons have the same number. While neutrons
have different number with protons and electrons. Protons are positive charges,
electrons are negative charges and neutrons have zero charges.