The half- life of actinium-228 is 6.13 hours What amount of a 70 milliqram sample remains after 24.52 hours?

4.375 milligram

Explanation:

Applying,

A = A'(2ᵃ/ⁿ) Equation 1

Where A = original amount of actinium-228, A' = amount of actinium-228 left after decay, a = Total time, n = half life

make A' the subject of the equation

A' = A/(2ᵃ/ⁿ) Equation 2

From the question,

Given: A = 70 milligram, a = 24.52 hours, n = 6.13 hours

Substitute these values into equation 2

A' = 70/(2²⁴°⁵²/⁶°¹³)

A' = 70/(2⁴)

A' = 70/16

A' = 4.375 milligram

answer is: nuclear fusion produces elements that are heavier than helium.

nuclei combine to form a heavier nucleus, releasing energy.  

for example, fusion of hydrogen atoms at the sun.  

this fusion nuclear reaction is in the inner core of the sun and hydrogen (atomic number 1) is conveted into helium (atomic number 2).  

the inner core is the central region of the sun and all solar energy is produced in the core by nuclear fusion.