Ch 17 - The Atomic Nature of Matter
Terms & Objectives
New terms in Chapter 17:
||phase of matter
Chapter 17 Core Ideas:
The core ideas in this chapter include:
- Matter is made of atoms.
- Atoms are "eternal." They are not created or destroyed in chemical interactions.
- Atoms are too small to be seen using visible light (approx. 10-10m).
- Molecules are made of atoms.
- Atoms are made of protons, electrons & neutrons.
- Protons & neutrons reside in the nucleus. They are called "nucleons."
- The nucleus is extremely small compared to atom.
- Almost all of the mass of the atom is in the nucleus.
- Electrons "orbit" the nucleus.
- Electron mass is about 1/2000 proton or neutron mass.
- The type of atom (element) is determined by the number of protons.
- The number of neutrons determine the isotope.
- Generally, number of electrons = number of protons.
- Fewer or greater number of electrons determine positive/negative ion.
- Common phases of matter include solid, liquid, gas, plasma
Chapter 17 Objectives:
When you complete Chapter 17, you should be able to:
- ... discuss the role of atoms as building blocks of matter.
- ... discuss the size of atoms, and evidence for the existence of atoms.
- ... discuss the concept "atoms are recyclable."
- ... identify elements as types of atoms, and know approximately how many elements exist.
- ... discuss, in general terms, the roles of protons, neutrons, and electrons in the atom.
- ... discuss the approximate relative masses of protons, neutrons, and electrons.
- ... discuss the relative size and mass of the atom and the nucleus.
- ... recognize that atoms combine to form molecules and compounds.
- ... tell what an ion is, in terms of the number of protons, neutrons, and electrons it contains.
- ... tell what an isotope is, in terms of the number of protons, neutrons, and electrons it contains.
- ... identify the four common phases of matter.
last update May 5, 2009 by JL Stanbrough