How do you find valence electrons in electron configuration?

Classify each statement about effective nuclear charge, zeff, as true or false.

Which statement is true regarding the diagram of circle p? the sum of y and z must be 2x. the sum of y and z must be x. the difference of z and y must be 2x. the difference of z and y must be x

Reactions in cells take place at about a. 40°c b. 0° c. 100°c d. 60°c