A student finds that 34.6 mL of 0.104 M HCl is required to titrate 20.2 mL of a NaOH solution to a phenolphthalein endpoint. What is the molarity of the solution

Question 3(multiple choice worth 4 points) (04.04 lc) what does it mean when an element is reduced? it empties a valance shell, reducing its atomic radius. it gains electrons, reducing its overall charge. it increases electronegativity, reducing its ability to bond. it loses electrons, reducing its electron number.

Ahelium balloon contains 16.9 l of helium at stp. how many atoms of helium are in the balloon

What are the trends and exceptions to the trends in electron affinity?