Does the fact that two elements combine in a one-to-one atomic ratio mean that the charges on their ions are both 1? Explain.

Write formulas for these compounds:

(a) strontium chloride
(b) potassium iodide
(c) aluminum nitride
(d) calcium sulfide
(e) sodium oxide

Congratulations! You discover a new element you name wyzzlebium $(\mathrm{Wz})$. The average atomic mass of $\mathrm{Wz}$ was found to be $303.001\mathrm{~amu}$, and its atomic number is 120 .

(a) If the masses of the two isotopes of wyzzlebium are $300.9326\mathrm{~amu}$ and $303.9303\mathrm{~amu}$, what is the relative abundance of each isotope?
(b) What are the isotopic notations of the two isotopes?
(c) How many neutrons are in one atom of the more abundant isotope?

Write the names and formulas for the four oxy-acids containing (a) bromine, (b) iodine.

The mass of an atom of silver is $1.79 \times 10^{-22} \mathrm{~g}$. How many atoms would be in a $0.52-\mathrm{lb}$ sample of silver?

What is an emission spectrum? How does an emission spectrum of a gas in a discharge tube differ from a white light spectrum?

Name these acids :

(a) $\mathrm{HNO}_2$
(b) $\mathrm{H}_2 \mathrm{SO}_4$
(c) $\mathrm{H}_2 \mathrm{C}_2 \mathrm{O}_4$
(d) $\mathrm{HBr}$
(e) $\mathrm{H}_3 \mathrm{PO}_3$
(f) $\mathrm{HC}_2 \mathrm{H}_3 \mathrm{O}_2$
(g) $\mathrm{HF}$
(h) $\mathrm{HBrO}_3$
(i) $\mathrm{HIO}_4$

In which of the following is the formula correct for the name given?

cadmium cyanide, $\mathrm{Cd}(\mathrm{CN})_2$

Why is there such a large increase in the energy required to remove a second electron from an atom of lithium?

Explain the large increase in ionization energy needed to remove the third electron from beryllium compared with that needed for the second electron.

In which of the following is the formula correct for the name given?

sodium dichromate, $\mathrm{Na}_2\mathrm{Cr}_2\mathrm{O}_7$

Would the Industrial Revolution have been possible without the use of slave labor? Why or why not?

What factors led to the Panic of 1819? What government regulations might have prevented it?

Write formulas for these acids :

(a) acetic acid
(b) hydrofluoric acid
(c) hydrosulfuric acid
(d) boric acid
(e) nitrous acid
(f) hypochlorous acid