Ununoctium, also known as eka-radon.
hope this helps!
Answer:
1 and 2
Explanation:
1. The moon blocks the sun's light from hitting the Earth. (It casts a shadow on the earth by doing so)
2. The moon moves between the Earth and the Sun. (So it blocks the sun's light)
Answer:
if u have to round it to the nearest ones plat 3.2 or 3.1 and if u have to round to the tenths place 3.16
Answer: 78.919 amu
Explanation:
If the natural abundance of Br-81 is 49.310%, then the natural abundance of Br-79 must be 100%-49.310%=50.690%
Substituting into the atomic mass formula,

11.30 i believe is the answer