Quimica

Name: Santiago Morales Pava 8-c

Making Models of Atoms & Isotopes
Problem: To build 3 – dimensional models of the hydrogen atom.
Background Information: An atom is defined as a small particlethat makes up most types of matter. Atoms are so small it would take about 1 million of them lined up in a row to equal the thickness of a human hair. Atoms are made up of even smaller particles. Thelargest of these particles are protons, neutrons and electrons. The identity of a type of matter depends on the number of protons in the nucleus of an atom of that type of matter. All atoms of the sametype of matter have the same number of protons in the nucleus. For example, all carbon atoms have six protons. Not all atoms of the same type of matter have the same number of neutrons. Most carbonatoms have 6 neutrons, although some have more and some have less. Atoms of the same type of matter that have different numbers of neutrons are called isotopes. Most types of matter have isotopes.
Theatomic mass, or mass number, can be used to identify isotopes. The mass number of a type of matter is the number of protons and neutrons in one atom of that matter. In our example of carbon, 6protons + 6 neutrons = 12 particles in the nucleus; the mass number = 12. The name for this isotope is Carbon – 12.
The symbol for Carbon – 12 is:
Mass Number-------12 Atomic Numbers------6

Re-writethe main ideas of the background information here:

Atoms are made up of even smaller particles. The largest of these particles are protons, neutron and electrons. The identity of a type of matterdepends of the numbers of protons in the nucleus of an atom of that type of matter. Al atoms of the same type of matter have the same number of protons in the nucleus. Atoms of the same type of matterthat have different numbers of neutrons are called isotopes. Most types of matter have isotopes.
The atomic mass or mass number can be used to identify isotopes. The mass number of a type of matter...