34) 1 Oxygen and fluorine are gaseous elements next to each other in the Periodic Table
Under the same conditions of temperature and pressure, oxygen diffuses
1 than fluorine because its 2 is less than that of fluorine.
Which words correctly complete gaps 1 and 2?
1
2
А
faster
molecular mass
B
faster
reactivity
с
slower
molecular mass
D
slower
reactivity

elements make up everything, and they combine to make compounds.

the answer is c

colorless gas, exhibiting a blue glow when placed in an electric field

b) solid

its a type of rock

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.