A) By adding or removing neutrons, determine which isotopes of the given element
ID: 786053 • Letter: A
Question
A) By adding or removing neutrons, determine which isotopes of the given elements are Stable and Unstable.?
^17, 9 F
^22,10 Ne
^11,6 C
^19,8 O
^13,6 C
^18,8 O
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B) Suppose the given data represents the abundance of isotopes of an element. Calculate the average atomic mass of lead based on the given data and the atomic masses.
Isotope Atomic mass Percent abundance
Pb?206 205.97 amu 12.8 %
Pb?207 206.98 amu 11.7 %
Pb?208 207.98 amu 75.5 %
Express your answer to four significant figures.?
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C) Select the following true statements about the abundance of isotopes on Earth, as shown in the PhET simulation by selecting Nature's mix of isotopes, and on planet X given the following information:
Average atomic mass values for planet X:
Oxygen 16.09 amu
Chlorine 36.97 amu
Magnesium 25.31 amu
Explanation / Answer
A)
17, 9 F ===> Unstable
22,10 Ne ===== > Stable
11,6 C ====> unstable
^19,8 O ====> Unstable
^13,6 C =====> Stable
^18,8 O ====> Stable
Note: for above elements , F- 19, C - 12,13 , Ne-20,21,22 , O -16,17,18 .... are stable.... rest of the isotopes are unstable...
B)
avg. Atomic mass = 205.97*0.128+206.98*0.117+207.98*0.755 = 207.6 amu
C)
True statement are
On Earth O?16 is more abundant and on planet X O?18 is more abundant
On Earth Cl?37 is more abundant and on planet X Cl?35 is more abundant.
On Earth and on planet X, O?16 has approximately the same abundance.
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