Atomic Structure/Periodic Table
What subatomic particle carries a negative charge?
Electrons
What makes an atom an isotope?
Having a different number of neutrons/different mass
Write the proper format for an alpha particle in a nuclear equation
42He2+
42a2+What percentage of a substance will remain after two half-lives if you start at 100%?
25%
How many electrons does neutral Fluorine have?
9 electrons
How many neutrons does Titanium-47 have?
25 neutrons
What type of radiation has the highest amount of penetrative energy?
Gamma radiation
How many half-lives will it take for 16 grams of Neon-21 to decay to 1 gram?
4 half-lives
What two subatomic particles are found in the nucleus?
Protons and neutrons
Hydrogen has three common isotopes: Hydrogen-1, Hydrogen-2, and Hydrogen-3 (AKA protium, deuterium, and tritium). Which of these three isotopes is the most abundant?
Hydrogen-1/Protium
Radium-227 has undergone radioactive decay into Actinium-227. What type of decay did the original isotope undergo?
Beta decay
If you start with 64 grams of a radioactive isotope with a half-life of 17 years, what is the mass of the isotope after 68 years?
4 grams
How many neutrons does Aluminum have on the periodic table?
14 neutrons
An element has two natural occurring isotopes, one with a mass of 13.99 amu and a natural abundance of 76%, and the other with a mass of 14.99 amu and a natural abundance of 24%. What is the average atomic mass of this element?
Show your work
14.23 amu
What is the daughter isotope for Astatine-212 undergoing alpha decay? Write in nuclear notation.
20883Bi
A substance with a half-life of 5 minutes decays from 32 grams to 8 grams. How much total time has passed?
10 minutes
List the amount of subatomic particles of this atom:
137N3-
Protons: 7
Neutrons: 6
Electrons: 10
Neon has three naturally occurring isotopes, Neon-20, Neon-21, and Neon-22. The natural abundances are 90%, 1%, and 9% respectively. What is the average atomic mass of Neon?
Show your work
20.19 amu
Write a nuclear decay equation for Plutonium-239 releasing a beta particle
23994Pu---> 01-B1- + 23995Am
If 47 grams of a radioactive substance remains after 24 hours, what was the mass of the original substance if the half-life is 8 hours?
376 grams
Why do most isotopes of hydrogen exist with only one proton and no neutrons in its nucleus?
i.e. why can hydrogen have a stable nucleus with no neutrons?
No proton repulsion due to only having one proton