DETERMINE LA FORMULA DE LA SAL HIDRATADA CUSO.XH20,, SI DESPUES DE CALENTAR 2,04 g DE ESTE COMPUESTO SE OBTUVO 1,30 g DE SAL ANHIDRA​

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Explanation:

Ne is a noble gas. It already has an octet of electrons hence, the electron affinity of neon is negative.

Br is a halogen, halogens need one electron to complete their octet. The electron affinity for bromine is negative.

Sodium is a metal that has only one electron in its outermost shell. The electron affinity of sodium is positive.

Magnesium is a metal having two electrons in its outermost shell. The electron affinity of magnesium is positive.

Chlorine is another halogen, energy is released when an electron is added to chlorine hence the electron affinity of chlorine is negative.