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Chapter 7
Chapter 7, Ionic and Bonding: vocab and key ideas
Question | Answer |
---|---|
What are valence electrons? | the electrons in the highest occupied energy level of an elements atom. |
How do you find the number of valence electrons in an atom of a represented element? | simply look at its group number. |
What is the purpose of electron dot stuctures? | they are disagrams that show valence electrons in the atom of the element as dots. |
What does the octet rule state? | in forming compounds, atoms tend to achieve the elcecton configuration of a noble gas. |
How are cations formed? | they are produced when an atom loses one or more valence electron. |
How are anions formed? | an anion is produced when an atom gains one of more valence electrons. |
The ione porduced when atoms of chlorine and other hydrogens gain electrons are called what? | halide ions |
What is an ionic compound? | a compound composed of cations and anions. |
The electrostatic forces that hold ione together in ionic compounds are called what? | ionic bonds |
What does a chemical formula show? | the number of atoms of each element in the smallest represented unit of a substance. |
What is a formula unit? | the lowest whole-number ratio of ions in an ionic compound. |
Most ionic compounds are crystalline _____ at room temperature. | solids |
Ionic compounds generally have ____ melting points. | high |
What is the coordinate number of an ion? | the numbers of ions of opposite charge that surround the ion in a crystal. |
What can ionic compounds conduct when melted or dissolved in wwater? | an electric current |
Metalic bonds are the forces of what? | of attraction between the free-floating valence electrons and the positively charged metal ions. |
What are alloys? | mixtures of two or more elements, at least one of which is metal. |
Why are alloys important? | because their properties are often superior to those of their component elements. |