Q42 of 400 Page 169

|How many electrons are there in the outermost shell of (i) a sodium atom, and (ii) a chlorine atom?

i) There is 1 electron is in the outer shell of the sodium atom,


ii) there are 7 electrons in the outer most shell of chlorine atom.



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41 Explain why, a salt which does not conduct electricity in the solid state becomes a good conductor in molten state. 42 Write down the electronic configuration of (i) sodium atom, and (ii) chlorine atom. 42 Show the formation of NaCl from sodium and chlorine atoms by the transfer of electron(s). 42 Why has sodium chloride a high melting point?