Pls help needs to be done soon thxs Valence Electrons: definition, how they increase across the Periodic table (periodic trend), and how they relate to both ionic and covalent bonding

What is a frequency of a wavelength

Imagine you had to physically add electrons, one at a time, to a previously neutral conductor. you add one electron very easily, but the second electron requires more work. in your initial post to the discussion, explain why this is. also, what happens to the work needed to add the third, fourth, fifth, and subsequent electrons

Polly is pushing a box across the floor with a force of 30 n. the force of gravity is –8 n, and the normal force is 8 n. which value could describe the force of friction if polly could not move the box?