LAS 4 IN SCIENCE, NEED HELP :)

Answer:
1). Law of Octaves
2). Atomic Mass
3). Periodic Law
4). Periodic System
5). Periodic Trends
6). Father of Modern Periodic Table
7). Number of Protons
Explanation:
I'm not sure in number 3 and number 4.
Mark me as a BRAINLIEST, please.