Some theories of aging suggest that free radicals cause certain diseases and perhaps aging in general. As you know from the Lewis model, such molecules are not chemically stable and will quickly react with other molecules. According to certain theories, free radicals may attack molecules within the cell, such as DNA, changing them and causing cancer or other diseases. Free radicals may also attack molecules on the surfaces of cells, making them appear foreign to the body’s immune system. The immune system then attacks the cells and destroys them, weakening the body. Draw Lewis structures for each free radical implicated in this theory of aging.
d. CH3OO (unpaired electron on terminal oxygen)
Solution 103 E Step 1 of 5 Radicals are chemical species in which there’s an atom with an unpaired electron. Since an atom doesn’t have the octet, this chemical species are very reactive Step 2 of 5 O2s made up by two atoms of oxygen. Since Oxygen belongs to VI A group, and since this is a negative monovalent ion, the total electrons can be obtained by this formula. Total electrons = 2(valence electrons of O) +1= 12 + 1= 13 Four electrons are implied in a double O=O bond. Atoms of Oxygen has two lone pairs each. The last electron of 17 goes to one of the atom of Oxygen, thus the Lewis structure is If we calculate the formal charge For Left Oxygen Formal charge= Electrons of valence - Electrons in lone pairs - ½ bonding electrons= 6-4-2=0 For right Oxygen Formal charge=Electrons of valence - Electrons in lone pairs - ½ bonding electrons - single electron= 6-4-2 -1 =-1 Thus the right Oxygen carries a -1 charge that can be extended to the whole structure, by indicating the Lewis structure in brackets and the (-) symbol at the upper right corner Electrons of valence - Electrons Step 3 of 5 O has seven electrons, one more than its valence electrons ,thus its structure is