Flashcards in Atomic Structure Deck (17):
Where are electrons found?
The electron cloud
How many electrons are in an element
The number of protons, or atomic number
Where are protons found?
Where are neutrons found?
Where is the nucleus located?
Center of atom
What is the basic unit of matter?
Atoms are _______ because they have equal amounts of protons and electrons.
Which atomic model shows electrons in energy levels around the nucleus?
The Bohr Model
How many electrons can the first energy level hold?
How many electrons can the second energy level hold?
How many electrons can the third energy level hold?
What is the current atomic model?
The Electron Cloud Model
Electrons in the outer energy shell
Atoms of the same element with different numbers of protons
The mass number of an element is ______.
A weighted average based on the abundance of each isotope in nature
Name 3 uses for radioactive isotopes.
Radioactive isotopes are useful for establishing the ages of various objects. The half-life of radioactive isotopes is unaffected by any environmental factors, so the isotope acts like an internal clock.
The radiation emitted by some radioactive substances can be used to kill microorganisms on a variety of foodstuffs, which extends the shelf life of these products. Produce such as tomatoes, mushrooms, sprouts, and berries are irradiated with the emissions from cobalt-60 or cesium-137. This exposure kills a lot of the bacteria that cause spoilage, so the produce stays fresh longer. Eggs and some meat, such as beef, pork, and poultry, can also be irradiated. Contrary to the belief of some people, irradiation of food does not make the food itself radioactive.