bio-chap 4 hw - October 7th 2010 Abby Alon Chapter...

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Abby Alon October 7 th 2010 Chapter 4-Homework 1 Page 72-73 Concept Check 4.1 1. The four most abundant elements in the body are oxygen, carbon, hydrogen and nitrogen. 2. Elements and compounds are different because elements are made up of one type of atom and compounds are made up of two or more different types of atoms. 3. A trace element that is still very crucial to the survival of a person is iron. Iron id very critical in carrying oxygen in the blood. Another example is iodine, which is important to help your thyroid gland function properly Page 74-77 Concept Check 4.2 1. Three subatomic particles are protons, neutrons and electrons. Protons have positive charges and are found in the nucleus of an atom. Neutrons are neutral, and are also found in the nucleus of an atom. Electrons have a negative charge, and are found in orbits around the nucleus of an atom 2. Isotopes are elements with the same atomic number but they have a different atomic mass and number of neutrons. Radioactive isotopes help researchers see
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