Transcript Atoms-PowerPoint

Atoms
Atoms
• Smallest particles of matter
• Contain protons, electrons, & neutrons
Element
• Substance that contains only one kind of
atom.
• Example: Sulfer, Oxygen, etc.
.
Molecule
• 2 or more of the same atoms
A model of an oxygen molecule. O2
Compound
• 2 or more different atoms combine chemically
• Example: Table salt (NaCl), water (H2O), sugar
(C6H12O6), etc.
Mixture
• When two or more substance are mixed
together but NOT chemically
• Example: salad
Elements on the Periodic Table
Krypton
36
Kr
Element (name)
Atomic Number
Symbol
83.80
Atom Mass
What an atom looks like:
What does this
look like as an atom.
We need to find the number of protons,
electrons, and neutrons.
How to find # of protons, electrons,
& neutrons in an atom.
• Protons: Atomic # = # of protons
• Electrons: Atomic # = # of electrons (because # of electrons equals #
of protons)
• Neutrons: Atomic Mass – Atomic Number = Neutrons
• *Round Atomic Mass to the nearest whole number
Element (name)
Krypton
36
Kr
Atomic Number
Symbol
83.80
Atomic Mass