X = atomic number - number of core electrons Which of the following explains the identity of X and its trends down a group?

A. X is the effective nuclear charge, and it remains constant down a group.

B. X is the screening constant, and it remains constant down a group.

C. X is the effective nuclear charge, and it increases down a group.

D. X is the screening constant, and it increases down a group.

Air can be considered a mixture. which statement does not explain why?

What are some natural measures of time

Tinererining 01: 57: 44 which statement correcte describes the actual veld and the theoretical yield of a reaction? textual vec is calculated to the reactant amounts but the theoretical yeld must be measured for each instance of a the actual vec is calculated from the amount of the limiting reactant and the theoretical yield is calculated from the 发公主 the actual weld depends on the reaction centers, but the theoretical yield and only with reactant amounts the actual vele represents the maximum weld possible and the theoretical yield assumes perfect reaction conditions save and ext e அட