Which notations represent different isotopes of the element sodium?
A. \(^{32}S\) and \(^{34}S\)
B. \(Na^+\) and \(Na^0\)
C. \(S^{2-}\) and \(S^{6+}\)
D. \(^{22}Na\) and \(^{23}Na\)
Answer (3)
The notations representing the different isotopes of the element sodium are:
22Na and 23Na
The total number of recognized isotopes of sodium is 20. It starts from 18Na upto 37Na with two isomers (22mNa and 24mNa).
23Na is considered as monoisotopic element meaning it has a single stable isotope making it primordial isotope. 23Na is a single isotope since earth was formed. It has a standard atomic mass of 22.989 769 28(2) u.
22Na, a positron-emitting isotope with a long half life = 2.605 years. It is used to create test objects and point sources for PET or positron emission tomography.
Different isotopes of sodium are denoted by 22Na and 23Na, where isotopes are variants of the same element with different numbers of neutrons but having the same number of protons.(Option 4) ;
The isotopes of sodium are represented by 22 N a and 23 N a . Therefore, the correct answer is option D. The isotopes differ in the number of neutrons they contain.
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