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These document represent class notes and exercises in biology, chemistry and physics with complete descussion and detailed solutions
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Exercise oneCalcium is a chemical element with the symbol Ca, atomic number 20 and mass number 40. Calcium
is essential to human body where it is used to build strong bones and teeth, clotting blood and
keeping a normal heart beat.
1. Write the atomic representation of calcium.
2. Indicate the number of each subatomic particle in a calcium atom.
3. What is the relative charge of the nucleus of this calcium atom?
4. What is the relative charge of the electron cloud of this calcium atom?
5. Deduce its atomic charge.
6. Pick out the uses of calcium.
Exercise two
Chlorine is a yellow-green gas at room temperature. It has an irritating odor similar to bleach.
Chlorine is represented as Cl having atomic number 17 and mass number 35.
1. Calculate the number of neutrons found in a chlorine atom.
2. What is the relative charge of the chlorine atom?
3. Indicate the most abundant isotope of chlorine referring to graph.
4. Pick out two characteristics of chlorine.
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