91Ó°ÊÓ

Magnesium atoms lose two electrons when they react. Write the symbol of the ion that is formed. Is it a cation or an anion?

Sulfur atoms gain two electrons when they react. Write the symbol of the ion that is formed. Is it a cation or an anion?

Write the electron configuration of potassium, \(Z=19,\) and show how a potassium atom can attain a noble gas configuration.

Which of the following ions are likely to form? Explain. (a) \(\mathrm{Li}^{2+}\) (b) \(\mathrm{K}^{-}\) (c) \(\mathrm{Mn}^{3+}\) (d) \(\mathrm{Zn}^{4+}\) (e) \(\mathrm{Ne}^{+}\)

How many electrons must an aluminum atom, \(Z=13\), lose to attain a noble gas configuration? Write the symbol for the ion formed.

Write symbols, both with and without electron dots, for the ions formed by the following processes: (a) Gain of two electrons by selenium (b) Loss of two electrons by barium (c) Gain of one electron by bromine

Blood serum in healthy adults normally contains approximately \(3.2 \mathrm{mg} / \mathrm{mL}\) of sodium ions \(\left(\mathrm{Na}^{+}\right)\) and approximately \(3.5 \mathrm{mg} / \mathrm{mL}\) of chloride ions \(\left(\mathrm{Cl}^{-}\right) .\) How many milliliters of blood serum would be needed to obtain \(1.0 \mathrm{~g}\) of \(\mathrm{Na}^{+}\) ? To obtain \(1.0 \mathrm{~g}\) of \(\mathrm{Cl}^{-} ?\).

Which element in the following pairs is likely to lose an electron more easily? (a) \(\mathrm{Be}\) or \(\mathrm{B}\) (b) \(\mathrm{Ca}\) or \(\mathrm{Co}\) (c) \(\mathrm{Sc}\) or Se

Which element in the following pairs is likely to gain an electron more easily? (a) \(\mathrm{H}\) or \(\mathrm{He}\) (b) \(\mathrm{S}\) or \(\mathrm{Si}\) (c) \(\mathrm{Cr}\) or \(\mathrm{Mn}\)

Name the following ions: (a) \(\mathrm{Cu}^{2+}\) (b) \(\mathrm{F}^{-}\) (c) \(\mathrm{Mg}^{2+}\) (d) \(\mathrm{S}^{2-}\)