Element Y is in the same group as X, but in the period below X (1
e) Give the chemical name for the element Y.
f) Compare the ionisation energy of these two atoms-which would have the larger
value? Give a reason for your answer.
g) Give the chemical formula of the compound that is formed when elementy
combines with chlorine,
h) Draw the Lewis structure to show the formation of the bond that has occurred in
this compound
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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.