Un element Y inconnue appartient a la meme periode que le magnesium (12Mg) et son schema de Lewis est: Y. a) ecrire la configuration electronique de l'atome Mg.
b) identifier l'element Y.
c) un element X appartient a la meme periode que Y et a la meme valence. Identifer X.
d) identifier la nature de la liaison qui pourrait lier (X) et (Y)

Explanation:

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the density of gold = 19.3 g/cm3

the relation between density and mass and volume is

density = mass / volume

given :

mass of gold = 13 g

density = 13g / volume = 19.3

volume = 13 /19.3 = 0.67 cm^3

thus volume of gold nugget = 0.67 cm^3