Jun Jie(40): Your answers are clear and the explanations are accurate. however, you could try changing to a smaller font and further break down your answers into different parts.
Chelsea(8): Your answers are really good and i like the pictures you've provided too. Your post was easy to read and very clear, it makes me more comfortable while reading through your post.
Michelle(30): The information you gave are accurate and i like your straight-forward answers. However, you seem to be missing a few questions. it would have been nice if you provided some pictures too.
Tuesday 12 July 2011
First Assignment
What does an atom looks like?
An atom is a basic unit of matter that consists of a dense, central nucleus surrounded by a cloud of negatively charged electrons
Subatomic particles are the smaller particles composing nucleons and atom
An atom consists of protons, electrons and neutrons, which are in turn, the subatomic particles that makes up an atom
Electrons carries a negative electric charge and it is a subatomic particle. It does not have any components or substructure. It has a mass of 1/1840 and has a -1 charge. The smallest part of an atom and it is found in the atom's shell.
Neutrons are large and heavy like protons, however it does have no electrical charge. It has the exact same mass as the proton.
The number of protons in the nucleus of an atom is called the proton number or an atomic number. The relative charge of the proton is +1 and its relative mass is 1.
Draw the atomic structure of a sodium atom and an sodium ion
The sodium atom is drawn this way as its electronic configuration is (2.8.1)
The sodium ion gave out one electron from it's last shell to make it stable, the electronic configuration is now (2.8)
An atom is a basic unit of matter that consists of a dense, central nucleus surrounded by a cloud of negatively charged electrons
Subatomic particles are the smaller particles composing nucleons and atom
An atom consists of protons, electrons and neutrons, which are in turn, the subatomic particles that makes up an atom
Electrons carries a negative electric charge and it is a subatomic particle. It does not have any components or substructure. It has a mass of 1/1840 and has a -1 charge. The smallest part of an atom and it is found in the atom's shell.
Neutrons are large and heavy like protons, however it does have no electrical charge. It has the exact same mass as the proton.
The number of protons in the nucleus of an atom is called the proton number or an atomic number. The relative charge of the proton is +1 and its relative mass is 1.
Draw the atomic structure of a sodium atom and an sodium ion
The sodium atom is drawn this way as its electronic configuration is (2.8.1)
The sodium ion gave out one electron from it's last shell to make it stable, the electronic configuration is now (2.8)
Draw the atomic structure of a sulfur atom and a sulfide ion
The sulfur atom has an electronic configuration of (2.8.6)
The sulfide ion gained two electrons on it's last shell to make it stable, the electronic configuration is (2.8.8) and now has a -2 charge.
Chlorine-35 atom and Chlorine-37 atom are called isotopes....Use these two examples to explain what is 'isotopes'.
Isotopes are different atoms of the same element which have the same number of protons but different number of neutrons.
Both chlorine-35 and chlorine-37 have 17 protons, but chlorine-35 has 35 neutrons and chlorine-37 has 37 neutrons. Since they are of the same element, have the same number of protons but not neutrons, they are isotopes.
Sodium is a metal and sulfur is a non-metal....why we classify them this way??
Sodium is a metal because it will lose 1 electron to complete the valance shell while Sulfur is a non-metal because it will gain 2 electrons to complete the valance shell. Metals lose electron(s) and become positively charged ion which is also known as a cation. Non-metals gain electron(s) and become negatively charged ion which is also known as an anion.
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