1. Which of the following elements would exhibit the greatest shielding effect?A

1. Which of the following elements would exhibit the greatest shielding effect?A. SodiumB. PotassiumC. LithiumD. Rubidium2. The number of energy levels to which an electron can jump depends on theA. amount of energy it absorbs.B. color of light only.C. wavelength of light only.D. electromagnetic spectrum.3. Ethyne differs from ethene in what way?A. Ethyne contains only carbon and hydrogen atoms.B. The carbons in ethyne are not fixed in place as they are in ethene.C. The carbons share three pairs of electrons in ethyne and only two pairs in ethene.D. The carbons in ethyne each form three single bonds whereas those in ethene each form four single bonds.4. What statement does not accurately describe the following equation?A. Oxygen is a reactant.B. This reaction is endothermic.C. This reaction releases energy.D. Eighteen atoms of oxygen are found as both part of the reactants and the products.