2.62 Predict the chemical formulas of the compounds formed by the following pairs of ions: (a) Cr3+ and Br, (b) Fe³+ and 02, (c) Hg and CO (d) Ca and CIO, (e) NH and PO 2.64 Complete the table by filling in the formula for the ionic compound formed by each pair of cations and anions, as shown for the first pair. Ca2+ Fe 2+ A/3+ lon oz NO SO 2- ASO 3- + Na Na 2.66 Which of the following are ionic, and which are molecular? (a) PF (b) Nal, (c) SC, (d) Ca(NO₂) (e) FeCl (f) LaP, (g) CoCO (h) ₂0¹ 2.78 The oxides of nitrogen are very important components in urban air pollution. Name each of the following compounds: (a) N₂O, (b) NO, (c) NO₂ (d) N₂O(e) N₂04

An ionic compound forms when lithium (Z=3) reacts with oxygen (Z=8). If a sample of the compound contains 8.4X10^21 lithium ions, how many oxide ions does it contain?

Write the empirical formula for at least four ionic compounds that could be formed from the following ions:

Para-aminobenzoic acid, PABA, is an organic compound that has been used as a component in suntan lotions. The formula of PABA is C7H7NO2. Using the periodic table in your courseware and what you learned in the chapter on measurements, determine the molecular mass of PABA.

In the compound Feg(PO4)2, the subscripts indicate: O the charge on Fe is +3, on O is -4, on PO4 is -2 O there are 3 Fe, 4 0, and 2 PO4 ions O the charge on Fe is +3, there are 2 PO4 ions there are four times as many oxygen atoms as iron atomS

For each of the following pairs of ions, write the symbol for the formula of the compound they will form:(a) Ca2+, S2−(b) NH4+ , SO42−(c) Al3+, Br−(d) Na+, HPO42−(e) Mg2+, PO43−

(a) What is the formula of the ionic compound expected to form between the elements aluminum and sulfur? (b) What is the formula of the compound formed between the ions SO32- and K+? (c) What ions make up the ionic compound FePO4 ? Cation formula Anion formula

The smallest unit of charge is −1.6×10−19 C, which is the charge in coulombs of a single electron. Robert Millikan was able to measure the charge on small droplets of oil by suspending them between a pair of electrically charged plates. Which of the values are possible charges of those oil droplets? −5.6×10−19 C −3.2×10−19 C −8.0×10−19 C −9.4×10−19 C −1.2×10−19 C −4.8×10−19 C

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The following paragraph is a description of the fictional element melbournium (Mb).   Mb in its elemental form, is a solid at room temperature. There are 38 protons in its nucleus. The sample of Mb in my laboratory has 40 neutrons. Its electronegativity is 0.5. I have been told that there is only one other isotope of Mb with 38 neutrons (which is 50% abundant).   All the information you require about Mb to answer the questions below is supplied in the statement above (it is a fictional element, so it is not on The Periodic Table). Data for F (fluorine), mentioned below, can be sourced from the Periodic Table. I.             Determine the atomic number of Mb. II.            Determine the mass number of the isotope that I have in my lab. III.           Determine how many electrons are in Mb. IV           Write the full electronic configuration of Mb using the correct rules for the energy levels. V.            Will Mb gain or lose electrons (and how many) to form an octet? Why? VI.…