Section 1 Stability in Bonding - sps186.orgFormulas Chemical formula- tells what elements a compound...
Transcript of Section 1 Stability in Bonding - sps186.orgFormulas Chemical formula- tells what elements a compound...
Ch 22
Section 1
Stability in Bonding
Compound The combination of two elements to form a new
substance.
When elements combine to make compounds the new substance usually has different characteristics than the elements.
Have different physical and chemical properties.
Formulas Chemical formula- tells what elements a
compound contains and the exact number of atoms of each element in a unit of that compound.
Subscript-means written below
Subscript tells how many atoms are in the compound.
Formulas Silicon dioxide has 1
silicon atom and 2 oxygen atoms.
Atomic stability Atoms want to be
stable.
To be stable an atom likes to have 8 electrons flying around it. (except hydrogen and helium)
Noble gasses have 8 electrons naturally so they don’t make compounds normally.
Outer levels Two elements that don’t have the 8 electrons that
they want can combine to form a chemical compound which gives both elements the stability they desire.
Ions Atoms that have lost or gained electrons.
Cation-positively charged ion
Anion- negatively charged ion