UNIT 2A Lessons 1-3 Flashcards
who am i?
I occur between a metal and a non-metal.
Ionic bond
who am i?
I occur between 2 non-metals.
Covalent bond
Why do atoms bond?
In order to gain stability.
What is the main difference between an ionic bond and a covalent bond?
In a covalent bond the atoms will share their electrons, while in an ionic bond the metal loses electrons and the non-metal gains electrons.
Describe an ionic bond.
One atom has a stronger attraction for electrons
than the other and “steals” the electrons
from the other atom. The atom with the higher
electronegativity will take the
electron(s) away from the other atom.
Describe a covalent bond.
The attraction for electrons is similar for two atoms. They share their electrons to obtain an octet.
What is the octet rule?
An atom with less than 8 electrons in the last shell tends to combine with another atom to fill its outer shell to a maximum of 8 electrons. (He and H only need 2 valene electrons)
What is the difference between a cation and an anion?
A cation has a positive charge while an anion has a negative charge. A cation loses electrons and an anion gains electrons.
How do you determine the charge of a metal ion?
A metal always loses electrons so the charge is always positive, the number value is = to the # of valence electrons.
How do you determine the charge of a non-metal ion?
A non-metal always gains electrons so the charge is always negative, the number value is = to 8 - valence electrons.
Where do you start adding dots (valence electrons) for the Lewis dot diagram?
Above the atom’s symbol and to the right. You go clockwise.
The charge of the metal in an ionic bond are they…..
number of “X” that can transfered to the non-metal.
