$$$ Review $$$ Atomic Theory Nuclear Chemistry
Post on 05-Jan-2016
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An element has an atomic number of 51. How many protons and electrons must this atom have if it is neutral?
51 protons, 51 electrons
How many protons, electrons, and neutrons does
a neutral atom with an atomic number of 85 and a mass number of 210 have?
85 p, 85 e, 125 n
How many protons, electrons, and neutrons does
a -3 charged atom with an atomic number of 85 and a mass number of 210 have?
85 p, 88 e, 125 n
Can you name three positive uses of nuclear radiation?
Radioactive dating, food irradiation, medical diagnostics, cancer treatment, pacemakers, etc.
T or F. A fission reaction occurs when two smaller nuclei come
together to create a new, larger nucleus.
False, fusion is being described
Can you name three conclusions from Rutherford’s gold foil
experiment.- Atom is mostly empty space (the nucleus is
small compared to entire size of atom)- Most of the mass of the atom is in the center- The positive charged particle (proton) must
be in the center of the atom
Element X contains three naturally occurring isotopes with masses of
78.0, 79.0, and 80.0 amu. What data is needed to calculate its
average atomic mass?
The natural abundance in percent of each isotope (Can you do these calculations?)
What was John Dalton’s main contribution to the theory of
the atom?
Elements are made of very small particles called atoms
T or F. A neutron and proton have roughly the same mass
and charge.
False, almost same mass but different charge
Atoms above 83 usually undergo _____ ______ while those below 83 usually undergo _____ _____?
alpha decay, beta decay
You should understand the atomic theory timeline and the various
models of the atom as they developed!!!
You should be able to calculate average atomic masses.
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