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70. Which pair of elements do you expect to be most similar? Why? a. nitrogen and oxygen b. titanium and gallium c. lithium and sodium d. germanium and arsenic e. argon and bromine

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Find to three significant digits the charge and the mass of the following particles. Suggestion: Begin by looking up the mass of a neutral atom on the periodic table of the elements in Appendix C.

(a) an ionized hydrogen atom, represented as H⁺

(b) a single ionized sodium atom Na⁺

(d) a doubly ionized calcium atom Ca⁺⁺=Ca²⁺

(e) the center of an ammonia molecule, modeled as an N³⁺ ion

(f) quadruple ionized nitrogen atoms, N⁴⁺, found in plasma in a hot star

(g) the nucleus of a nitrogen atom

(h) the molecular ion H₂O^-