Atom The “smallest piece” of The “smallest piece” of matter that still keeps matter that still keeps all the properties of the all the properties of the element element (we will talk about (we will talk about properties later) properties later) All matter is composed of All matter is composed of
21
Embed
Atom The “smallest piece” of matter that still keeps all the properties of the element (we will talk about properties later) All matter is composed of.
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Atom
The “smallest piece” of matter that The “smallest piece” of matter that still keeps all the properties of the still keeps all the properties of the
elementelement(we will talk about properties later)(we will talk about properties later)
All matter is composed of atomsAll matter is composed of atoms
AtomHave we ever seen atoms?
Yes – ever since the invention of the scanning tunneling electron microscope in 1981 by Nobel Laureates Gerd Binnig and Heinrich Rohrer
Platinum atoms
Molecule
Another “smallest piece” of matter – Another “smallest piece” of matter – but are made of two or more atoms.but are made of two or more atoms.
All matter is composed of moleculesAll matter is composed of molecules
Molecule
Matter -
Anything that has mass and Anything that has mass and takes up spacetakes up space
Pure Substance: is either an
ElementElementor aor a
CompoundCompound
Element-
Has only one kind of atom, Has only one kind of atom, found on the periodic tablefound on the periodic table
Examples of Elements
Anything on the Anything on the periodicperiodic table table
H He
O Ne
K Ar
N Kr
C Xe
Ca Rn
Compound -
Substance with two or more Substance with two or more kinds of atoms bound kinds of atoms bound
togethertogether
Example: Water
The elements hydrogen and The elements hydrogen and oxygen combineoxygen combine
Example : Salt
The elements sodium and The elements sodium and chloride combine (NaCl)chloride combine (NaCl)
Mixture – is a impure substance made of two or more
things mixed together
Can be separated by Can be separated by physical means, physical means,