D. Kinda simple, don’t think much explaining is needed.
The answer is B for the apex answer
Answer:
The approximate mass of beryllium is 9.0045 u.
Explanation:
Given data:
mass of helium= 4.002 u
mass of beryllium which is 2.25 times of mass of helium= ?
Solution:
we will multiply the mass of helium with 2.25 times,
4.002 u × 2.25 = 9.0045 u
so the mass of beryllium atom would be 9.0045 u.
Explanation:
because Xenon is Noble gas
0 1 2 3
0 and 3 is 3
1 and 2 is 3