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Isotopes
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Questions (317)
An isotope of lead, 201Pb, has a half-life of 8.4 hours. How many hours ago was there 40% more of the substance? (Round your
4 answers
asked by
Dee
2,255 views
The element boron has three naturally occuring isotopes. One has the atomic mass 10.0129(54.4%), another 11.0093(12.75%). What
4 answers
asked by
Anonymous
1,016 views
This Chem problem is really difficult -Need help please!
Magnesium Consists of three naturally occuring isotopes. The percent
4 answers
asked by
Mary Joy
1,648 views
There are two stable isotopes of Gallium Their masses are 68.92558 and 70.9247050 AMU. If the average atomic mass of gallium is
3 answers
asked by
Emily
1,803 views
Write the correct symbol in standard form for the isotope of platinum that contains 118 neutrons.
4 answers
asked by
Haile
4,140 views
Magnesium has three naturally occurring isotopes: 24 Mg (23.985 amu) with 78.99% abundance, 25 Mg (24.986 amu) with 10.00%
4 answers
asked by
Anonymous
3,242 views
Silver has two naturally occurring isotopes (Ag-107 and Ag-109).
(a) Use the periodic table to find the atomic mass of silver.
3 answers
asked by
NEED HELP
2,168 views
The element europium exists in nature as two isotopes: 151^Eu has a mass of 150.9196 amu, and 153^Eu has a mass of 152.9209 amu.
7 answers
asked by
Sean P.
2,726 views
The atomic mass of Eu is 151.96. There are only two naturally occurring isotopes of europium, 151Eu with a mass of 151.0 and
3 answers
asked by
Kumar
8,035 views
Gallium has an atomic mass of 69.7 amu. In a typical sample, 60.4% of Ga exxists as a Ga-69 (68.9257 amu). What isa the identity
3 answers
asked by
Jun
1,901 views
Why is deuterium oxide called “heavy water”?(1 point)
Responses It has extra oxygen atoms. It has extra oxygen atoms. Its
5 answers
asked by
Jace Antoino
103 views
What are the number of protons, neutrons, and electrons in the following isotopes ?
82 ^ 36 Kr
3 answers
asked anonymously
33 views
What are the number of protons, neutrons, and electrons in the following isotopes ?
14 ^ 28 Si
3 answers
asked anonymously
34 views
The isotopic abundance of naturally occurring hydrogen is as follows:
1H 99.985 atom % 2H 0.015 atom% When H2 gas is formed from
3 answers
asked by
Jane
853 views
How would I solve this:
The atomic mass of 6/3Li and 7/3Li are 6.0151 amu and 7.0160 amu, respectively. Calculate the natural
4 answers
asked by
Amy~
2,013 views
1.What would happen to poisonous chlorine gas if
protons were added neutrons were added 2. Boron is 80.20% boron -11 (atomic mass
3 answers
asked by
Nikita
1,100 views
Rubidium has two naturally occurring isotopes: 85Rb and 87Rb. The natural abundance of 85Rb is 72.165% and it has an isotopic
4 answers
asked by
IRA
1,264 views
The relative atomic mass of a sample of chlorine which contains 75.78% chlorine -35 and 24.22% chlorine-37 is ____.
3 answers
asked by
Maryann
586 views
Magnesium has three isotopes, 24Mg, 25Mg and 26Mg . The relative abundance of the 26Mg isotope is 10%.The relative atomic mass
2 answers
asked by
xoxCharlotte
1,176 views
One isotope of a nonmetallic element has mass number 16 and 7 neutrons in the nucleus. The anion derived from the isotope has 10
3 answers
asked by
Dani
1,446 views
Which symbol correctly represents an element (D) whose atoms contain 15 protons and 20 neutrons?
A. 20/15 D B. 15/20 D C. 35/15 D
9 answers
asked by
Ms. Sue Please help me
1,575 views
Four isotopes of Lead occur naturally:
204Pb (mass = 203.973037 amu) 206Pb (mass = 205.974455 amu) 207Pb (mass = 206.975885 amu)
3 answers
asked by
Kayla
915 views
Three isotopes of Argon occur naturally:
36Ar (mass = 35.9675 amu) 38Ar (mass = 37.9627 amu) 40Ar (mass = 39.9624 amu) If the
3 answers
asked by
Amanda
775 views
A hypothetical element has three main iso- topes with mass numbers of 81, 83, and 84. If 17.00% of the isotopes have a mass
3 answers
asked by
chanel
1,277 views
one of the tin isotopes has 50 protons and 63 neutrons. another isotope of tin might have a)50 protons and 0 neutrons
b)50
4 answers
asked by
Anonymous
1,147 views
Mercury-197 is used for kidney scans and has a half-life of 3 days. if the amount of mercury-197 needed for a study is 1.0 grams
3 answers
asked by
monique n
1,997 views
I have to write a bunch of atomic symbol for these isotopes and I don't understand how to I do it.
(a) atomic number=53, number
4 answers
asked by
SC
1,495 views
A hypothetical pure element consists entirely of two isotopes. The natural percent abun- dance of the isotope with mass 25.6 u
1 answer
asked by
brooke
419 views
Why wasn't information about the mass of isotopes sufficient for identifying the isotopes? Provide an example to explain the
3 answers
asked by
Joe
710 views
Zinc has three major and two minor isotopes. For this problem, assume that the only isotopes of zinc are the major ones,
4 answers
asked by
Jess
2,248 views
Some nitrogen atoms have seven neutrons and some have eight neutrons. These two forms of nitrogen are:
a. ions of each other b.
3 answers
asked by
carl
1,639 views
The species __________ contains 16 neutrons.
a. 16O b. 31P c. 34S2- d. 80Br- e. 36Cl
5 answers
asked by
Laila
2,989 views
What is the difference between an element and an isotope?
An isotope is an element with a different number of neutrons. An
3 answers
asked anonymously
39 views
What makes an isotope of an element?
Different forms of an element have the same number of protons but different numbers of
3 answers
asked anonymously
40 views
An unknown element Q has two known isotopes: 60Q and 63Q. If the average atomic mass is 60.5 amu, what are the relative
4 answers
asked by
Ashley
1,651 views
There are three stable forms of neon: neon-20, neon-21, and neon-22. Which statement is true?(1 point)
Responses The number of
3 answers
asked anonymously
39 views
there are two naturally occurring isotopes of the element zinc. the relative abundance and mass of each are as follow
64
3 answers
asked by
000
539 views
Silicon has three naturally occurring isotopes: Si-28 with mass 27.9769 amu and a natural abundance of 92.21%, Si-29 with mass
4 answers
asked by
NEED HELP
1,878 views
Why is deuterium oxide called “heavy water”?(1 point)
Responses It has extra hydrogen atoms. It has extra hydrogen atoms. It
2 answers
asked by
zeo
86 views
Which element has no stable isotopes?
1. (subscript)27 Co 2. (subscript)51 Sb 3. (subscript)90 Th 4. (subscript)82 Pb I believe
5 answers
asked by
Anonymous
3,151 views
Beryllium has an atomic number of 4. How many neutrons does the isotope beryllium-9 have?(1 point)
Responses 13 13 5 5 4 4 9
2 answers
asked anonymously
45 views
Why is deuterium oxide called “heavy water”?(1 point)
Responses Its hydrogen atoms are heavier than others. Its hydrogen
2 answers
asked by
i hate big bugs and i cannot lie lol
92 views
write isotpoic symbols of the form X-A (for example, C-13) for each of the following isotopes.
**Do I add the number of protons
3 answers
asked by
Melinda
2,472 views
identify the following element if it has three naturally occurring isotopes 50% of which have an atomic mass of 127 amu, 40% at
3 answers
asked anonymously
70 views
Enter the symbol for the isotope used in brain scans Express your answer as an isotope.
2 answers
asked anonymously
33 views
There are three stable forms of neon: neon-20, neon-21, and neon-22. Which statement is true?(1 point)
Responses Their number of
11 answers
asked anonymously
124 views
To determine the atomic mass of an element, the masses of all the naturally occurring isotopes of that element are averaged
2 answers
asked anonymously
62 views
Sam is comparing the half-life of two isotopes of uranium. The half-life of Uranium-238 is 4.5×109 years. The half-life of
2 answers
asked by
kat
142 views
Why is deuterium oxide called “heavy water”?(1 point)
Responses It has extra oxygen atoms. It has extra oxygen atoms. Its
2 answers
asked anonymously
194 views
What is an isotope with 6 protons and 8 neutrons
2 answers
asked anonymously
18 views
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Parent Categories (17)
Atomic Attributes
Atomic Mass
Atomic Structure
Atoms
Atoms and Elements
Chemistry
Elements
Elements and Materials
Inorganic Chemistry
Nuclear Chemistry
Nuclear Physics
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Periodic table
Radioactive Decay
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