Answer:
15.7g
Explanation:
mass percent=mass of element/mass of compound *100
39.34=unknown(x)/40g×100
39.34=5x/2
multiplying both sides by 2,we get
5x=78.68
devide by 5 on both sides
x=15.74g Na
Answer:
60-20=40km west because the direction Will favour whichever direction is bigger
Answer:
Valence electrons are important, as they indicate an element's bonding behavior, stability, and reactivity.
Explanation: