the measured EA of Na is -53 KJ/mol. What is the physical meaning of the fact that the EA is a negative number?

Chemistry & Chemical Reactivity
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Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
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Chapter2: Atoms Molecules And Ions
Section: Chapter Questions
Problem 18PS: Which of the following are isotopes of element X, the atomic number for which is 9: 919X, 920X,...
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the measured EA of Na is -53 KJ/mol. What is the physical meaning of the fact that the EA is a negative number? 

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EA means the electron affinity . 

The amount of heat is released when 1 electron is added to the valance cell of the atom to make an uni negative ion .

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