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a schematic description of a system that accounts for its know properities
the center of an atom containing the protons and nuetrons
the numbers of protons in an atom
the sum of neutrons and protons in the nucleus of an atom
atoms with the same number of protons but different numbers of neutrons
a collection of atoms that all have the same number of protons
an atom with a nucleus that is not stable
the time it takes for halr of the original sample of a radioactive isotope to decay
Order the three constituet parts of the atom IN TERMS OF THEIR MASS FROM LEAST MASSIVE TO MOST MASSIVE.
What force keeps the protons and neutrons in the nucleus? What causes this force?
The strong nuclear force. it occurs as a result of the fact that protorns and nuetrons exchange pions with one anotheer
What force keeps the electrons orbiting around the nucleus.
What is an atom mostly made of?
An atom has a atomic number of 34. How many protons and electrons does it have ? What is its sylmbol?
Se is the symbol and it has 34 electrons and protrons.
List the number of protons , electron and neutrons for each of the following atoms.
56Fe 139La 24Mg 20 Ne
Fe: 26 protons, 26 electrons, 30 neutrons
La: 57 protons , 57 electrons, 82 neutrons
Mg: 12 protons, 12 electrons, 12 neutrons
Ne: 10 protons , 10 electrons, 10 neutrons
Two atoms are isotopes. the first has 18 prtons and 20 nuetrons. the second has 22 neutrons. how many protons does it have?
which of the following are isotopes?
112Cd 112Sn 120Xe 124Sn 40Ar 120Sn
112Sn and 124Sn 120Sn
what is the largest bhor orbit in a uranium atom and how many electrons are in it.
5th orbit and 32 electrons
why is the strong force nuclear force such a short ranged force.
Since pions have a very short lifetime, the strong nuclear force can only act over very tiny distances.
determine the daughter products produced in the beta decay of the 2 radioactive isopes shown below: 1: 98Tc 2: 125I
determine the daughter products of these atoms after alpha decay:
212Bi 2: 224Ra
A radioactive isotope goes through radioactive decay but the isotopes number of protons and neutrons does not change . what kind of radioactivity decay occurred.
The half-life of the radioactive decay of 226Ra is 1600 years. if a sample of 226Ra originally had a mass of 10 grams how many grams of 226Ra would be left after 3200 years.
X 2.5 grams
if the life of a man-made isotope 11C is 2o minutes. If a scientist makes I gram of 11C how much will be left in 1 hour.
why is radioactive dating inrelable in most situations
with radioactive dating you have to make assumptions.
List the 3 types of radioactive particles discussed in this moduale in order of their ability to travel through matter. start with the weakest one.
alpha particles pass through the least amount of matter before stopping , beta particles are next, gamma rays pass through the most matter before stopping.
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