Atomic Structure
What is the charge of a protons, neutron and electron?
Proton- positive
Neutron- neutral
Electron- negative
What is the atomic number and mass number of Gold-198
Atomic number=79
Mass number=198
What is the AAM of Nitrogen-14 (99.6%) and Nitrogen-15 (0.4%)
14.004 amu
Fill in the missing element
239 Pu + 4 He ------> 1 n + ________
94 2 0
239 Pu + 4 He ------> 1 n + 242 Cm
94 2 0 96
What will be the mass of a 35.0 g sample of curium-238 (half-life = 2.4 hr) after 9.6 hours?
mf=2.19 g
Where are protons, neutrons and electrons located?
Nucleus- Protons and Neutrons
Electron Cloud- Electrons
What is the atomic number of zirconium?
What is the average atomic mass of Bromine?
79.904
(can vary slightly depending on periodic table used)
Fill in the missing element
238 Pu -------> 4 He +_______
94 2
238 Pu -------> 4 He + 234 U
94 2 92
What percent of the initial sample remains after 4 half lives?
6.25%
What is the smallest particle that retains an elements properties?
An Atom
What is atomic number and mass number
Atomic Number- number of protons, element number
Mass Number- number of protons+neutrons
What is average atomic mass?
Weighted average of all naturally occurring isotopes
Fill in the missing particle
60 Co ------> 60 Ni + _______
27 28
60 Co ------> 60 Ni + 0 B
27 28 -1
What is half-life?
The amount of time required for half of the atoms in a radioactive isotope to decay.
What the difference between an element, ion and isotope?
Element- different number of protons
Ion- different number of electrons
Isotope- different number of neutrons
What is the mass number, atomic number, protons, neutrons and electrons in Bohrium-264
Mass Number=264
Atomic Number=107
Protons=107
Neutrons=157
Electrons=107
What is the average atomic mass and element name with the following mass and abundance? (2 decimal places)
Element- 40 (96.94%)
Element- 41 (3.06%)
40.03 amu, Calcium
Carbon-14 undergoes beta decay
14 C -----> 14 N + 0 e
6 7 -1
Radium-224 has a half-life of 3.66 days. What was the mass of the original sample of radium-224 if 0.0500 g remains after 7.32 days?
mi=0.200 g
What two things are equal in a neutral element?
Protons and electrons
What is the number of protons, neutrons and electrons in Tin-120?
Protons=50
Neutrons=70
Electrons=50
An unknown element has the following mass and abundance, calculate the AAM.
Element-121 (57.21%)
Element- 123 (42.79%)
121.8558 amu
Copper-59 emits a positron and something else
59 Cu -------> 0 e + 59 Ni
29 1 28
Phosphorus-32 has a half-life of 14.3 days. If an initial sample has a mass of 4.00 mg, how many milligrams will remain after 71.5 days?
mf=0.125 mg