Question

The atomic number and mass number of sodium are 11and23 respectively. What information is conveyed by this statement.

Answer 1

The atomic number and mass number of sodium are 11and23 respectively. This means that the sodium has 11 protons in its nucleus and also has 11 electrons in the aton to balance the total charge of the atom and keep it neutral . The mass no. means the relative mass of sodium compared with 1/12 the mass of a carbon C-12 isotope . It means it is 23 times heavier than 1/12 th the mass of one C-12 isotope of carbon. Also it says that one atom of sodium has ( 23 - 11 ) = 12 no. of neutrons in its nucleus.

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Answer 2

Explanation:

The atomic number and mass number of sodium are 11 and 23 respectively.

This suggests that number of proton in sodium =11 and number of nucleons i.e. proton and neutrons in sodium =23.   Thus, number of neutrons =12 and also Since no. of protons = no. of electrons =11

So, they are similar.

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