Upal. Consider the elements sodium, aluminium, silicon and sulphur. Which one will form
an oxide that will give a pH of less than 7 when in solution?​

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sodium

Explanation:

this is because sodium is neutral hence the pH formed will be 7

the atomic mass is the bottom number on the element.

-steel jelly

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.