Need asap 53 1. in your own words, explain the periodic law. 2. why did mendeleev leave gaps in his early periodic table, and what was the ultimate importance of the gaps? 3. what properties do metalloids display, and where are metalloids found on the periodic table?

1. According to the periodic law, both chemical and physical elements and their properties are periodic functions of their atomic numbers, thus recurring in a predictable periodical pattern

2. Mendeleev knew that some certain elements existed, he expected that in the future, the gaps would be filled because at the time, they had not been discovered yet.

3. The properties of metalloids are boron (B), silicon (Si), germanium (Ge), arsenic (As), antimony (Sb), tellurium (Te), polonium (Po) and astatine (At). They are found between metals and non-metals on the periodic table. They appear in a stairstep-like pattern.

the formula would be mgso4

mgso[subscript]4

i believe the answer is a.