Which of the following changes is observed when we move across the row from left to right in the periodic table? Atomic radius increases

Atomic radius decreases

Number of protons decreases

Chemical reactivity of metals increases

Can someone me with questions 15 to 17 plz.

What is calcium oxide+diphosphorus pentoxide--> calcium phosphate balanced

)in the deacon process for the manufacture of chlorine, hcl and o2 react to form cl2 and h2o. sufficient air (21 mole% o2, 79% n2) is fed to provide 35% excess oxygen, and the fractional conversion of hcl is 85%. calculate the mole fractions of the product stream components.