Half Life
True or false: the half-life of an element depends on how much sample you start with
False, half-life is constant for elements
How many protons are in the isotope 8429Cu?
What is 29 protons
The atom to the left of the arrow is called the
Parent Nucleus
An alpha particle is
What is two protons and 2 neutrons (He)
The percentage of radioactive isotope that decays over each half-life is
50%
What is the nuclear symbol for sulfur-40?
4016S
2410Ne -----> + 208O
The emitted particle is
What is and alpha particle, 42He?
A beta particle is
What is the size of an electron with a negative charge
After 70 days, how many half-lives of Argon-37 (half life is 35 days) have elapsed?
What is 2
How many neutrons are in the isotope Carbon-14?
What is 8 neutrons?
Sodium-11 undergoes beta particle emission. The atomic mass of the dughter element is
What is 11 amu.
Positron emission is
What is an electron with a positive charge
Starting mass of C-14 is 100g, the mass remaining after 2 half lives
What is 25g C-14
The nuclear symbol for the isotope silver-102
What is 10247Ag
The nuclear equation for Phosphorous-30 undergoes positron emission
3015P --> 0+1e + 3014Si
The symbol for gamma ray radiation
00Y
The mass remaining of U-239 after 4 half lifes is 10g. What is the original mass of U-239 in the sample?
The nuclear symbol for an atom that has 18 protons, 20 neutrons, and 18 electrons
What is 3818Ar
What is the product of the alpha decay of Thorium-232
22888Ra
Atomic weight of gamma radiation
What is zero