72. 64. 15. a. a. Boron has three valence electrons. 17. 16. 5. The chemical properties of an element are determined by the number of _____________ its atoms contain. Which of the statements describe a bond? Join Yahoo Answers and get 100 points today. b. water takes up a great deal of heat in changing from its solid state to its liquid state. , Emily H, No Comment, June 30, 2016 Molecules, where some atoms have fewer than eight electrons, are called electron deficient. e. Charges balance out and none of the atoms has any charge. b. Covalent bonds are the most important means of bonding in organic chemistry. You can sign in to vote the answer. But sulfur can unpair its electrons and promote one of its electrons (highlighted in green) to an empty 3d orbital. , Joan, 1 Comment, September 5, 2016 41. a. What percentage of alcoholics successfully complete the Salvation Army program? An element is the fundamental structural unit of matter. How do you think about the answers? 56. c. The bond between O of one water molecule and O of a second water molecule. 77. Which type of chemical bond is the most important for biological molecules? But what happens when this occurs? How will my inability to eat during the first trimester affect my baby? 38. Which phrase is an example of what electrostatic... What is a Metallic Bond? Chemistry Definitions: What is a Steric Number. Sulfur can follow the octet rule as in the molecule SF2. b. Results from an unequal sharing of electrons between atoms. Sciences, Culinary Arts and Personal 10. Why is a helium atom (Atomic #2) more stable than a hydrogen atom (Atomic #1)? 33. ? For an atom to achieve maximum stability and become chemically unreactive, what must occur? e. The bond between the H of a water molecule and the H of a hydrogen molecule. d. The concentration of OH- ions increases. Each atom has an equal number of electrons and protons. An atom of nitrogen attracts electrons more strongly than an atom of hydrogen. He holds bachelor's degrees in both physics and mathematics. Note the lone electron on the nitrogen atom in the Lewis structure. A covalent bond is the same as a ionic bond. The Octet rule only applys to molecules with covalent bonds. Eight electrons completely fill its outermost electron shell. Two, because sulfur is below oxygen on the periodic table and has two unpaired electrons. -9 Hence sulfur obeys octet rule in this case. 14. Free radicals contain at least one unpaired electron in their valence shell. Deduce... To melt an ionic solid, energy must be supplied to... Classify the bond in NBr3 as ionic or covalent. 1H and 22Na b. The part of the atom of greatest biological interest is the a. proton. e. Water takes up large amounts of heat when it vaporizes. Hydrogen, beryllium, and boron have too few electrons to form an octet. Molecules that are electrically attracted to water molecules are __________________. 73. Water is HEAVIEST in what region? A single covalent chemical bond represents the sharing of how many electrons? , charm 68. Beryllium has only two valence atoms, and can form only electron pair bonds in two locations. a. The main idea is that Sulfer does not form a covalent bond.