The document summarizes key concepts about the structure of atoms and the nature of matter: 1) Atoms are made up of protons, neutrons, and electrons, with protons and neutrons located in the nucleus and electrons located outside the nucleus. 2) Isotopes of the same element have the same number of protons but different numbers of neutrons, and all isotopes of an element have the same chemical properties. 3) Compounds have different physical and chemical properties than their constituent elements due to the formation of chemical bonds between the elements.

1. 2.1 The Nature of Matter p34
Q: What three subatomic particles make up
atoms?
A: The subatomic particles that make up
atoms are protons, neutrons, and electrons.

2. 1. Atoms-basic unit of matter
• Nucleus-center of the atom
• Contains positive protons & neutral
neutrons.
• Electron-negatively
charged outside

3. Elements and Isotopes
Q: How are all of the isotopes of an element
similar?
A: Because they have the same number of
electrons, all isotopes of an element have
the same chemical properties.

4. • Element-pure substance, one type of atom
Isotopes-same element, different # neutron
Radioactive Isotopes-nuclei unstable &
break down.

5. Chemical Compounds
Q: In what way do compounds differ from
their component elements?
A: The physical and chemical properties of a
compound are usually very different from
those of the elements from which it is
formed.
• Compound-chemical combo of 2 elements
ex: water

6. Chemical Bonds
Q: What are the main types of chemical
bonds?
A: The main types of chemical bonds are
ionic bonds and covalent bonds.

7. Ionic Bonds-1 or more electrons transfered
• Ions-+ and – charged atoms

8. Covalent Bonds-shared electrons
• Molecule-smallest unit of a compound
Van der Waals Forces-attraction of
oppositely charged regions of nearby
molecules

9. •WKBK pgs
Read pg 16
•Answer
Questions
17-18