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this is practically all about chem here. see how it progress. in any case, pardon me.i know my blog sucks :)
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Friday 1 July 2011
Atomic Structure Assignment @ 03:13
Mr Tan: Hi tcher..u know..i even went to the extent of taking photos of my drawings bcos I just couldn't directly paste it in my post. i put in sooo much effort for this :D MUST give me high marks tcher.thank you and please be sure to give me a longg comment. Thanks again. :D
1) What does an atom looks like? What are the sub-atomic particles inside it.....(talk about electrons, neutrons, protons, electron shells, nucleus....)
1) What does an atom looks like? What are the sub-atomic particles inside it.....(talk about electrons, neutrons, protons, electron shells, nucleus....)
Atoms are made up of three different particles – protons, neutrons and electrons. These particles are known as sub-atomic particles.
For example, the diagram on the left shows the atomic structure of a Helium atom that contains two protons, two neutrons and two electrons. Inside the nucleus of the atom, proton and neutron exist. Proton (p) has a relative charge of (+1) and relative mass of 1. Neutron (n) has a relative charge of 0 and relative mass of 1. The particle outside the nuclues is called electron. Its symbol is e and it has a relative charge of (-1) and relative mass of 1/1840. All atoms are neutral. Each atom contains equal number of positively charged protons and negatively charged electrons. Neutrons have zero charge.
The proton number (atomic number) is the number of protons in an atom. The nucleon number (mass number) is the number of protons and neutrons in the nucleus of the atom. The valence shell (outermost shell) is the shell which is furthest from the nucleus. The valence electrons are the electrons in the outermost shell of an atom. If the valence shell is full, the atom is stable or unreactive with other atoms. By gaining or losing electrons, atoms gain stability. Atoms that gain electrons are namely negative ions and atoms that gives out electrons are postive ions. Electronic configuration of each atoms tells us the arrangement of electrons in the various shells of an atom of molecule.
2) Draw the atomic structure of a sodium atom and a sodium ion....explain why you draw it this way.
3) Draw the atomic structure of a sulfur atom and a sulfide ion....explain why you draw it this way.
4) Chlorine-35 atom and Chlorine-37 atom are called isotopes...Use these two examples to explain what is 'isotopes'.
Conclusion:
5) Sodium is a metal and sulfur is a non-metal....why we classify them this way??
Atoms of metals tend to lose valence electrons to form positive ions or cations. Sodium atom loses an electron to form a Sodium ion, Na+, a cation, hence, it is a metal.
Atoms of non-metals tend to gaiin electrons to form negative ions or anions.
Sulphur atom gains 2 electrons to form a Sulphur ion, S2–, an anion, hence, it is a non-metal.
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