Chemistry of Life

Chemistry of Life

Atoms, elements & Molecules

Digital Text-"The Periodic Table"

Poll

The four most common elements found in living organisms are Oxygen, Nitrogen, Hydrogen and

• Carbon

• Fluorine

• Sodium

• Potassium

Living things consist of atoms of different elements

Atom is the smallest basic unit of matter

All atoms share the same basic structure...

• Protons (positive charge +)

• Neutrons (Neutral charge )

• Electrons (Negative charge -)

• These smaller inner particles are located within the nucleus

All atoms share the same basic structure...

• Multiple scientists spent years to describe or model what the atom looked like

• John Dalton was the first to say that all matter is composed of tiny particles called atoms & could not be divided any further

• JJ Thompson & Rutherford discover the inner particles (i.e. electron, neutron, & proton)

Multiple Choice

An atom has equally numbered positive & negative charged particles, which makes the net charge

• positive

• negative

• no charge (neutral)

• Wait...I have to do math?

Elements- made up of only one type of atom

Elements

• Elements differ in the # of Protons

• The atomic # of an element is defined by the # of protons

• The # of electrons of each element determines the properties of that element (i.e. gas, liquid, solid, metal. nonmetal)

• Compounds involve two different elements bonded together (Ex: H2O & CO2)

Poll

Another way of describing a compound is to say,

• Different groups of atoms combining together

• More than one element combines with a molecule

• Molecules composed of more than one different atom

• The bonded pairing of different elements to form new substances

Open Ended

How are elements different from compounds?

Atomic Love Connection?

A molecule is 2 or more atoms held together by covalent bonds. Almost all of the substances that makeup organisms (i.e. ATP, DNA, RNA, Water) are molecules.

Open Ended

How does a molecule differ from an atom?