Half Life
Define the term half life
The time it takes for half of a substance to decay
Alpha decay produces a different element and ___________
Helium Nucleus (2 Protons + 2 Neutrons)
True/False: Ions are radioactive
False
What ae the columns and rows called in the periodic table? (Specify which is each)
Periods = Rows
Groups = Columns
What happens once in a minute, twice in a moment, but never in a thousand years?
The letter M
What is the formula used to quickly calculate half life?
1 / 2x
Beta decay produces a different element and ____________
An electron
What is the difference between an Ion and an Isotope?
Ions deal with electrons, Isotopes, deal with Neutrons
Elements in the 2nd group on the periodic table have how many valence electrons?
2 valence electrons.
The more of me you share, the less of me you have. What am I?
Secrets
If a sample of Carbon has 80g, how much will be left after 1 half life?
40g
Gamma decay releases a high-energy _______________
Photon
What charge does an O2- atom have?
-2
Elements in the 3rd period have how many electron shells? (energy levels?)
3 electron shells
What can you hold without touching it?
Your breathe
If you have a 64g sample of Uranium and Uranium has a half life of 3 days, how much will be left after 12 days?
4g
Rank the 3 types of radioactive decay from weakest to strongest
Weakest - Alpha
- Beta
Strongest - Gamma
Carbon-12 and Carbon-14 are examples of ________
Isotopes
How many groups are there on the periodic table?
18
What gets wetter the more it dries?
A towel
If an element is reduced to 25% of its original mass in 24 hours, how long is its half life?
12 hours
A uranium-238 nucleus undergoes alpha decay. What is the resulting element?
(Consult the periodic table for protons)
Thorium-234 (+ Helium nucleus (2 protons+2 neutrons))
An atom has 11 protons, 10 electrons, and 12 neutrons. What is the element and charge?
Sodium, +1 charge
Why don't elements in the 18th group like to bond with other elments?
They have complete valence electron shells
A cowboy rode into town on Friday, stayed 3 days, and left on Friday. How is this possible?
His horse's name was Friday