question, if thallium (atomic number 81) has an effective nuclear charge of 3+, how many core electrons does thallium have? is it 78?

Describe the interaction that occurs between two objects with the same electrical charge.

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Which statement about hf is true? it is zero for any compound in its standard state. it is positive when the bonds of the product store more energy than those of the reactants. it is negative when a compound forms from elements in their standard states. it is zero for any element that is in the liquid state.