Element x has an electron configuration that ends with 5p6. which of the following describes this atom correctly?

a. unstable metal
b. noble gas
c. alkali metal
d. unstable nonmetal

The biosphere of the earth is made up of what compound? organic or inorganic?

How many liters of oxygen gas, at standardtemperature and pressure, will react with 35.8 grams ofiron metal? 4 fe (s) + 3 o2 (g) → 2 fe2o3 (s)

Will mark as brainliest ! how many grams of iron metal do you expect to be produced when 245 grams of an 80.5 percent by mass iron (ii) nitrate solution react with excess aluminum metal? show all work needed to solve this problem!