Câu 30:Hút chính xác 10ml dd NaCl 0,05N cho vào bình tam giác, rồi chuẩn độ bằng dung dịch AgNO3tốn hết 9,5 ml. Tính nồng độ dung dịch AgNO3.

first one is the correct answer

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.