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Read the given expression. x = number of protons − number of core electrons which of the following explains the identity of x and its trends across a period? x is the effective nuclear charge, and it remains constant across a period. x is the screening constant, and it remains constant across a period. x is the effective nuclear charge, and it increases across a period. x is the screening constant, and it increases across a period.

Drag each label to the correct location on the chart. classify each reaction as endothermic or exothermic.

What is the mass of 0.46 mol of mgcl2