Answer: helium
Explanation:
Edit: im really sorry i thought i was answering a different question.
50 degrees, the angle of incident is always equal to the angle of reflection
Answer:3
Explanation:
The three moles of S are divided by the moles in your product in this case 1 (AlS)
3/1=3
Answer:
The vertical columns on the periodic table are called groups or families because of their similar chemical behavior.
Explanation:
All the members of a family of elements have the same number of valence electrons and similar chemical properties. The horizontal rows on the periodic table are called periods.