1) Consider the atoms O^16, O^18, F^18, Ne^18, and Ne^20. A) Which atoms are iso

ID: 1267044 • Letter: 1

Question

1) Consider the atoms O^16, O^18, F^18, Ne^18, and Ne^20.

A) Which atoms are isotopes?

B) Which atoms have the same number of nucleons?

C) Which atoms have the same chemical properties?

D) Which atoms have the same number of neutrons?

E) Which atoms have the same number of valence electrons?

Please explain reasoning.

2.a Is there a Li 30^(Z=3 nucleus? If so, is it stable or radioactive? If not, why not?

2b. is there a 184^U(Z=92 nucleus? is so, is it stable or radioactive? If not, why not?

3. 3^He has a binding energy of 2.5 MeV/nucleon and the nucleus 6^Li has a binding energy of 5MeV/Nucleon.

a) What is the toal binding energy of 3^He?

b) what is the total binding energy of 6^Li?

c)is it energetically possible for two 3^He nuclei to join and fuse together into a 6^Li nucleus? Explain.

d) is it energetically possible for a 6^Li nuclei to split or fission into two 3^He nuclei? Explain.

1) A) Which atoms are isotopes? ==> O^16, O^18 and Ne^18, Ne^20 (same atomic number)

B) Which atoms have the same number of nucleons? ==> O^18, F^18, Ne^18 ( all have 18 nucleones)

C) Which atoms have the same chemical properties? ==> O^16, O^18 and Ne^18, Ne^20( isotopes have same chemical properties)

D) Which atoms have the same number of neutrons? ==> O^16,Ne^18 have 8 neutrones and O^18, Ne^20 have 10 neutrones

E) Which atoms have the same number of valence electrons? ==> O^16, O^18 have 6 eletrones, F^18 have 7 eletrones , Ne^18, Ne^20 have 8 eletrones

2) No there exists no such nucleus

because n = 27 and p=3

==> n/p =27/3=9 which is not possible

b) For uranium n/p= 92/92= 1 which is stable.....so not radioactive

total binding nergy = binging energy per neucleon*number of nucleones

a) ==> for Helium

total binding nergy =2.5*3= 7.5 eV

b) ==> for Lithium

total binding nergy =5*6= 30 eV

c) Energetically speaking

a) when two neucleides combine energy should decrease

but two helium have 15 ev energy and lithium has 30 eV

so combintion is not possible

b) when one nucleus split in two energy should decrease

one Lithum has 30 eV and two hilium has 15 eV enegy

so since energy is decreasing spliting of lithum in 2 hilums is possible

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