Subatomic particles
nuclear chemistry
Half-Life
isotopes
Nuclear Reactions
100
positively charged
What is a proton?
100
this is the same thing as a helium nucleus
What is an alpha particle?
100

the amount of time it takes for HALF of a given radioactive substance to decay into a more stable isotope.

What is a half-life?

100
isotopes of the same element differ in this
What is the number of neutrons?
100

The alpha decay of Pu-239 forms an alpha particle and what else?

U-235

200
these have equal masses
What are a proton and a neutron?
200
this decay particle has the same properties as an electron
What is a beta particle?
200

I-131 has a half life of 8 days. How much of a 14 g sample is present after 16 days?

3.5 g

200
Number of neutrons in chlorine-37
What is 20?
200

What type of decay is involved in Bi-214 becoming Po-214?

beta

300
these have equal but opposite charges
What are a proton and an electron?
300

this type of decay results in the emission of radiation that has no mass or protons.

What is gamma?

300

The half life of thorium-234 is 24 days. How much time must pass for 1/8th of a 100 gram sample to remain?

What is 72 days?

300
This number goes in the top left corner of isotope notation
What is the mass number?
300

Potassium-40 undergoes decay to form Calcium-40 and this radioactive particle.

What is an electron or beta particle?

400
this was the first subatomic particle discovered
What is the electron?
400

the mass of the starting nucleus undergoing alpha decay decreases by this much

What is 4?

400

In 1995, a 100 g of Co-60 was stored. In 2010, 12.5 g remained. What is its half-life?

5 years

400

The number of neutrons in Uranium-240

What is 148?

400

Determine the missing particle:

146C -->_____ + 0-1e

Nitrogen - 14

500
the number of these determines the identity of an element
What is a proton?
500
This happens to the atomic number of the initial nucleus during beta decay
What is increases by 1?
500

You found a 30 gram sample of volcanic rock that contains Potassium-40. 

If ORIGINALLY there had been 120 grams of this rock when it formed 2.6 billion years ago, what is the half life of Potassium-40?

What is 1.3 billion years?

500

What is average atomic mass of Lithium if 7.42% exists as Li-6 and 92.58% exists as Li-7?

What is 6.9 amu?

500

Determine the missing particle and type of decay:

23994Pu --> 42He + _____

Uranium - 235

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