Isotopes, isobars and isotones: identify or describe

1. A.
   isotopes
2. B.
   isobars
3. C.
   isoelectronic species
4. D.
   isotones

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1. A.
   These have same number of neutrons.
2. B.
   These are the atoms of different elements.
3. C.
   These have same atomic number.
4. D.
   These have different mass number.

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1. A.
   ${}^{12}_6\text{C}$; ${}^{14}_6\text{C}$
2. B.
   ${}^{12}_6\text{C}$; ${}^{11}_5\text{B}$
3. C.
   ${}^{14}_6\text{C}$; ${}^{14}_7\text{N}$
4. D.
   ${}^{13}_6\text{C}$; ${}^{11}_5\text{B}$

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1. A.
   These are the atoms of same elements.
2. B.
   They have same chemical properties.
3. C.
   They occupy same position in the modern periodic table.
4. D.
   They have equal number of neutrons.

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1. A.
   ${}^{3}\mathrm{He}_2$ and ${}^{4}\mathrm{He}_2$
2. B.
   ${}^{24}\mathrm{Mg}_{12}$ and ${}^{25}\mathrm{Mg}_{12}$
3. C.
   ${}^{40}\mathrm{K}_{19}$ and ${}^{40}\mathrm{Ca}_{20}$
4. D.
   ${}^{40}\mathrm{K}_{19}$ and ${}^{39}\mathrm{K}_{19}$

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