2. STEM The mass of an atom of helium is about 4.002 atomic units.

The mass of an atom of beryllium is about 2.25 times the mass of an

atom of helium. What is the approximate mass of a beryllium atom?

The approximate mass of beryllium is 9.0045 u.

Explanation:

Given dа ta:

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.