1) Which of the following species is electrically neutral and why ?
N a + ,   C l - ,   K + ,   N a ,   C a + 2

Dear Student,
Na is electrically neutral because the number of protons = number of electrons.
Na has an 23 electrons and 23 protons
While others are charged species, having either excess of electrons(-ve ions) or deficiency of electrons (+ve ions)
Regards!

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The answer is Na because it does not have any charge. Na+,Cl -...in these the symbol + or - denotes the charge and tells you if it is cation or anion.
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Na 
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Na
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Here, 'Na' or sodium is electrically neutral. It does not have any charge on it. Thus, it is completely neutral. The '+' or '–' sign indicates the presence of charge on an element. 
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