What type of reaction is photosynthesis, the process where carbon dioxide combines with water to form glucose in the presence of sunlight

endothermic

Explanation: An endothermic reaction is a type of of chemical reaction in which energy is absorbed from the surrounding. The temperature of the surrounding decreases.

An Exothermic reaction is a type of chemical reaction in which energy is released into the surrounding. The temperature of the surrounding increases.

Thus as photosynthesis is taking place, it absorbs energy from surroundings in the form of sunlight and thus is considered as endothermic reaction.

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.

6.4 cm (max) - 25 cm (min)