Too much inhalation of carbon dioxide can cause one to faint. The amount of carbon dioxide we take in when we breathe in is not enough to cause harm to our body. However, with too much carbon dioxide in our body, the consequences may be dire. If we are exposed to high amounts of carbon dioxide for a long period of time, there will be acid imbalance in the blood. We would also breathe faster.
Oxygen
A totally harmless gas to humans and instead is vital for survival. Without oxygen, one may faint or even die. It is also needed for combustion so it plays another important role by maintaining fire for cooking or warmth. It is also a colorless and odourless gas. Oxygen makes up around 21% of the gas in the air.
Carbon
Carbon is mostly found underground in different forms such as lead, graphite or diamond. It can be both a cheap or expensive item depending on which allotrope it is. Carbons are highly stable and require high temperature to react with other elements.
Bonding and Dot and Cross Diagram
Covalent Bonding
Reference
http://en.wikipedia.org/wiki/Carbon_dioxide
http://www.ccohs.ca/oshanswers/chemicals/chem_profiles/carbon_dioxide/health_cd.html
http://www.google.com.sg/images?um=1&hl=en&rlz=1C1SKPC_enSG358SG358&biw=1366&bih=667&tbs=isch:1&sa=1&q=CO2+dot+and+cross&aq=f&aqi=&aql=&oq=
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