Read about the stability of isotopes on Wikipedia !

Quiz about isotopes
1 Look at your periodic table. What could you say about the number of isotopes of fluorine on earth?
There is only one.
2
more than 2
Probably there is only one or one of them is predominant.
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2 Look at your periodic table. What could you say about the number of isotopes of chlorine on earth?
probably 2 or more
2
more than 2
Probably one .
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3 Look at your periodic table. What could you say about the number of isotopes of bromine on earth?
2
Probably 2 or more.
more than 2
Probably one.
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4 Look at your periodic table. What could you say about the number of isotopes of copper on earth?
1
2
probably 2 or more
Probably one.
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5 Which of the following pairs are not isotopes
Fe2+ et Fe3+
239U and 239Pu
N and N2
16O and 17O
None of the previous
6 Which one of the following is probably a stable isotope of phosporus?
28P
31P
34P
31S
None of the previous.
7 Which one of the following is probably a stable isotope of scandium?
40Sc
45Sc
50P
45K
None of the previous.
8 Which one of the following is probably a stable isotope of phosporus?
127I
I2
139I
79Br
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9 Atomic masses and percentage of occurence of lithium isotopes on earth are following: 6.01512, 7.59% et 7.01600, 92.41%. Find the atomic mass of lithium element appearing in the periodic table!
7.000
3.000
6.516
6.941
None of the previous!
10 Atomic masses and percentage of occurence of tungsten isotopes on earth are following: 179.946701, 0.12%; 181.948202, 26.50%; 182.950220, 14.31%; 183.950928, 30.64%; 185.954357. Find the atomic mass of tungsten element appearing in the periodic table!
74
182.95
183.84
109.84
None of the previous!
11 Which one of the following is probably a stable isotope of technetium ?
98Tc
43Tc
55Tc
100Tc
None of the previous.
12 Which one of the following is probably a stable isotope of thorium ?
90Th
232Th
142Th
There are no stable isotopes of Thorium.
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13 On 20th of february 2020, the physicist Modeste Pompon will discover a new element, Modestonium (Mm) , atomic number 124. Mass spectrometry will reveal that Mm consists of 80.00% 314.0Mm and 20.00% 312.0Mm. Calculate the mass which Modeste Pompon will write on the periodic table?
313.6
313.0
314.0
312.4
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14 Which one of the following statements is true?
Until atomic number 20, the number of protons equals approximately the number of neutrons.
An isotope having 60 protons and 60 neutrons ought to be stable.
Tin has probably one natural stable isotope.
Radon has several stable isotopes.
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15 235U is a fissile isotope of uranium and is used in nuclear reactors. 238U is not fissile. Looking at the atomic mass of uranium, decide what statement is correct!
Natural uranium should possibly be used in nuclear reactors.
A difficult and expensive separation of 235U from natural uranium is needed before using it in nuclear reactors.
There is no fissionable uranium in naturally occurring uranium.
There exists only one natural isotope of uranium.
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16 Isotopes of the same element have almost identical chemical reactivity. However, replacing hydrogen-1 by l'hydrogen-2(deuterium) results in differences in the speed of reactions by a factor of 7. Explain!
Hydrogen is diatomic.
Hydrogen is a gas.
Deuterium is twice heavier than hydrogen-1.
Hydrogen is the most common element of the universe (90%).
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