How many atoms of Br are there?How many atoms of Br are there?

8

Explanation:

There are 8 atoms of Br because there are two molecules of 4 atoms of Br. 4 x 2 = 8.

1 mol Br contains 6.022×1023Br atoms;its mass is 79.90 g.

Explanation:

: I mole or bromine refers to 6×10^23 molecules of bromine. But 1 molecule of bromine has 2 atoms. Hence the atom count will be exactly twice.

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.