Biology head acheninozzka

Biology Head Acheninozzka
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Unformatted text preview: 2. Atoms & Molecules: Ions Part A A cation with two units of charge has 10 neutrons and 8 protons. The ion also has ... 6 electrons. Part B Which statement is true of the molecule shown here? It's both a cation and an anion. Part C The atoms shown here will become ions if they meet because ... atoms tend to have filled valence shells. Part D True or false: Ions may form by transferring an atomic nucleus (with or without electrons) to another molecule. True 5. Atoms & Molecules: Covalent Bonds Part A Covalent bonds hold atoms together because they ... do both (a) and (b). Part B In molecules, C, H, O, and N atoms usually make __, __, __, and __ bonds respectively. 4, 1, 2, 3 Part C An atom's atomic number is 7. Its valence is most likely ... 3 Part D By making two covalent bonds, an O atom (with 8 protons) fills its valence shell. Why does the atom's charge stay close to zero? Shared electrons aren't always near oxygen. Part E In a double covalent bond, a carbon atom shares ... electrons in two orbitals. Part F The ammonia molecule in the diagram has the observed bond orientation because ... All of the above. Part G Without making or breaking bonds, the pictured molecule can change its shape because ... rotation can occur around single bonds. Part H Two C atoms form a double bond. Each C is bound to two H atoms. Which statement is true? All the atoms lie in a plane. Part I Partial charges occur when ... (b) atoms share electrons unequally. Part J To fill the valence shell, an electrically neutral, unbonded atom with atomic number 8 must add ... 2 electrons. Part K Which answer helps to explain why carbon atoms tend to make 4 covalent bonds? The valence shell needs 8 electrons....
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