The nucleus of lithium contains three protons and three neutrons. When two electrons are removed from the neu-
tral lithium atom, the remaining electron has an average
distance from the nucleus of 0.018 nm. What is the force
between the electron and the nucleus at this separation?

With i really need the correct answer!

An ionic compound can conduct electricity when a it is dissolved in water b its crystals are ground into powder c it is in solid form d it is heated to just below its melting point

The first-order reaction a→2b+c has rate constant 0.538 s−1. if the initial concentration of a is 0.867 mol l−1, what is the half-life of the reaction in seconds? remember to use correct significant figures in your answer (round your answer to the nearest hundredth). do not include units in your response.