Which group of elements gain electrons?

Explanation for basic character?

Upon decomposition, one sample of magnesium fluoride produced 1.65 kg of magnesium and 2.56 kg of fluorine. a second sample produced 1.32 kg of magnesium. part a how much fluorine (in grams) did the second sample produce?

Measurements that have similar values are: a. usually accurate b. sometimes accurate c. always accurate d. never accurate