Chemical Bonding: Study Guide

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Bonding Fill in the missing words, the first letter of the blank words are an anagram of a key bonding word. What is the mystery word??? Why do Chemical bonds form? Bonds between atoms involve their outer electrons. When atoms bond together they share or transfer electrons to achieve a more stable electron arrangement, often a full outer main level of electrons, like the noble gases. There are three types of strong chemical bonds: 1.__ionic______, 2.____covalent____ and metallic IONIC bonding • Ionic bonding occurs between metals and non-metals • Metal atoms 3. ___lose___ electrons • Non-metal atoms gain electrons • Positive and negative ions are formed Sodium chloride has ionic bonding. [pic] • The sodium ion is positively charged because it has lost a negative electron…show more content…
We can represent one pair of shared electrons in a covalently bond by a line, Cl- Cl. In a double bond four electrons are shared. The two atoms in an oxygen molecule share two pairs of electrons so that the oxygen atoms have a double bond between them. We can represent the two pairs of shared electrons in a covalent bond by a double line, O=O. [pic] How does Sharing electrons hold atoms together? Atoms with covalent bonds are held 9._____together____ by the electrostatic attraction between the nuclei and the shared electrons. This takes place within the molecule. The simplest example is hydrogen. The hydrogen molecule consists of two protons held together by a pair of electrons. These forces just balance when the nuclei are a particular distance apart. Co-ordinate bonding A single covalent bond consists of a pair of electrons shared between two atoms. In most covalent bonds, each atom provides one of the electrons. But, in some Bonds, one atom provides both the electrons. This is called co-ordinate bonding. It is also called dative 10.______covalent____

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