) How many molecules are present in each sample? 6.10 mol SO2 : molecules SO2 0.463 mol CO : molecules CO a sample of NH3 containing Avogadro's number of molecules: molecules NH3
1.) How many molecules are present in each sample?
6.10 mol SO2 :
molecules SO2
0.463 mol CO :
molecules CO
a sample of NH3 containing
molecules NH3
2.) Enter the number of electrons in each energy level (shell) for each of the elements. If the energy level does not contain any electrons, enter a 0. It may help to refer to the periodic table.
He:
?=1
?=2
?=3
?=4
F:
?=1
?=2
?=3
?=4
Cl:
?=1
?=2
?=3
?=4
K:
?=1
?=2
?=3
?=4
What is the neutral atom that has its first two energy levels filled, has 2 electrons in its third energy level, and has no other electrons? Enter the name of the element, not the abbreviation.
element name:
3.) How many valence electrons do atoms of each of the elements have?
Sr :
valence electrons
Xe :
valence electrons
Ge :
valence electrons
P :
valence electrons
4.) Iridium‑192 is one radioisotope used in brachytherapy, in which a radioactive source is placed inside a patient's body to treat cancer. Brachytherapy allows the use of a higher than normal dose to be placed near the tumor while lowering the risk of damage to healthy tissue. Iridium‑192 is often used in the head or breast.
Use the radioactive decay curve of iridium‑192 to answer the three questions.
a.) Estimate the half‑life of the radioisotope.
half-life:
days
b.) How many days would it take for two‑thirds of the sample to decay?
time:
days
5.) Calculate the percent activity of the radioactive isotope strontium‑89 remaining after five half‑lives.
activity:
%
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