What is the electron configuration of an Fe2+ ion?

1s2 2s2 2p6 3s2 3p6 3d6

Explanation:

We are required to determine the electron configuration of Fe²⁺

We need to know that;

Atomic number of Iron (Fe) is 26

Fe²⁺ will have 24 electrons

Thus, electron configuration of Fe²⁺ is 1s2 2s2 2p6 3s2 3p6 3d6

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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.