Explain what d and l represent in stereoisomers

Stereoisomers are isomers that have the same connectivity between their atoms but differ in the arrangement of their atoms in space. Specifically, D and L stereoisomers allow to designate the dextrorotatory and levorotatory carbons respectively of the molecules with a single asymmetric carbon.

Explanation:

A dextrorotatory carbon rotates the polarized light in a clockwise turn and a levorotatory carbons rotates the polarized light in counterclockwise turn. Also, there is a designation Rule for L and D carbons. First, the molecule is represented in Fischer projections with the carbon chain in the vertical direction and with the most oxidized side up and the smallest down. Second, the groups that integrate it towards the back of the plane are represented backward. Finally, the D stereoisomer will be the one who presents the functional group to the right and the L stereoisomer will be the one who presents the functional group to the left.

The most common example of D and L stereoisomers is D-glucose and L-glucose, both differ on the orientation of the -OH group at the carbon 5.

2b2t

explanation:

2b2t

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.