Ions and chemical bonds (ionic bonds and covalent bonds)
Define the following terms:
Recall valence electrons
How to use Lewis Dot Notation
•Use the chemical symbol of the element.
•The dots represent the number of valence electrons (group #).
•Only 2 dots can be on each side.
•Always start with 1 dot on each side before pairing up dots.
•Does not matter which side you start pairing.
•Looking at Nitrogen’s lewis dot structure do you think nitrogen will want to lose 5 electrons or gain 3 to get a full outer shell of electrons? Which would be easier?
Complete the lewis dot structure for the following elements:
Atoms that gains or loses electrons.
Positive ions lose electrons ~ less electrons than protons
Negative ions gain electrons ~ more electrons than protons
Cations are Positive
(the t looks like a +)
Metals (left side of periodic table)
Anions are Negative
(the n stands for -)
Non-metals (right side of periodic table)
Bonds between atoms are created when electrons are paired up by being transferred or shared.
A compound is formed when two or more kinds of atoms are bound together chemically.
Two kinds of chemical bonds:
Electrons are given up by the metal and taken by the non-metal.
Their opposite charges cause them to remain close together.
Usually between a metal (cation) and a non-metal (anion)
Electrons are shared between the two atoms.
Stronger bond than ionic.
Usually between two non-metals.