2018 Mod13 Flashcards
(21 cards)
Write out the definitions for the following terms:
A. Model
A systematic description of a system that account for the noon property
B. Nucleus
The center of an Adam containing the protons and neutrons
C. Atomic number
The Number of protons in an atom
D. Mass number
The sum of the number of neutrons and protons in the nuclear us of an Adam
E. isotopes
Adams with the same number of protons but different number of neutrons
F. Element
A collection of Adams that have the same number of protons
G. Radioactive isotope
And Adam with a nuclear us that is not stable
H. Half-life
The time it takes for half of the original sample of a radioactive isotope to decay
Order the three consistent part of an Adam in terms of their mass, from least massive two most massive
Electron, protons, neutrons
What force keeps the protons and neutrons in the nuclear us,? What causes this force?
The nuclear force.
The exchange of pions in the nuclear us
What force keeps the electronic ordering around the nuclear us?
The electromagnetic force
What is an Adam mostly made of
Empty space
And Adam has an atomic number of 34 how many protons and electrons does it have? What is it symbol?
Protons equals 34 electrons equals 34
Se
Do you atoms are isotopes the first has 18 protons and 20 neutrons the second has 22 neutrons how many protons does the second Adam have
18 protons
What is the largest for all of it in our uranium Adams the symbol for uranium is U and how many electrons are in it?
The pattern for electrons is 2, 8, 18, 32, 50,
So five 32 elections in the past or a bit
What is the strong such a short range force?
Pions have a short life and do not travel far
A radioactive isotope goes through radioactive decay, but the isotopes number of protons and neutrons does not change. What kind of radioactive decay occurred?
Gamma decay
The half-life of a radioactive decay of a 226 RA is 1600 years if it sample of 226 Ra originally had a mass of 100 g how many grams of it would be left after 3200 years
That would be two half life so 25 g
Life of a man-made isotope 11 C is 20 minutes. If a scientist makes 1 g of 11 see how much will be left in one hour?
That is 60 minutes which equals three half-lives so 0.125 g will be left
Why is radioactive dating unreal liable in most situations
It is fraught with potential errors, and we don’t know the original quantity of radioactive substance in the sample
List three types of radioactive particles discussed in this module in order of their ability to travel through matter. Start with the part of the call that cannot pass through much matter before stopping and end with the one that can pass through almost the most matter before staffing
Alfa, beta, gamma
