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Chapter 7

Chapter 7, Ionic and Bonding: vocab and key ideas

QuestionAnswer
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.
Created by: jmhschemistry