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Chapter 2: Problem 2
List the types of radiation that are known to be emitted by radioactive elements.
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Give two differences between a metal and a nonmetal
Why do all atoms of an element have the same atomic number, although they may have different mass numbers? What do we call atoms of the same element with different mass numbers? Explain the meaning of each term in the symbol \({ }_{Z}^{A} \mathrm{X}\).
Name these compounds: (a) \(\mathrm{Na}_{2} \mathrm{CrO}_{4},\) (b) \(\mathrm{K}_{2} \mathrm{HPO}_{4}\) (c) HBr (gas), (d) HBr (in water), (e) \(\mathrm{Li}_{2} \mathrm{CO}_{3},\) (f) \(\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7},(\mathrm{~g}) \mathrm{NH}_{4} \mathrm{NO}_{2}\) (h) \(\mathrm{PF}_{3}\) (i) \(\mathrm{PF}_{5},\) (j) \(\mathrm{P}_{4} \mathrm{O}_{6}\) (k) \(\mathrm{CdI}_{2}\) - (I) \(\mathrm{SrSO}_{4},(\mathrm{~m}) \mathrm{Al}(\mathrm{OH})_{3},(\mathrm{n}) \mathrm{Na}_{2} \mathrm{CO}_{3} \cdot 10 \mathrm{H}_{2} \mathrm{O} .\)
Draw two different structural formulas based on the molecular formula \(\mathrm{C}_{2} \mathrm{H}_{6} \mathrm{O}\). Is the fact that you can have more than one compound with the same molecular formula consistent with Dalton's atomic theory?
What is wrong or ambiguous about these descriptions? (a) \(1 \mathrm{~g}\) of hydrogen, \((\mathrm{b})\) four molecules of \(\mathrm{NaCl}\).
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