An atom of which of the following elements has the smallest first ionization energy?

Which of the following is a weak acid in aqueous solution?

What are the products of the following reation?2NaOH(aq) + Cu(NO3)2 (aq) ®

Which of the following electron configurations is impossible, according to the Pauli exclusion principle?

A student is given a sample in lab that contains one of the ions listed below. After adding a few drops of AgNO3 solution to a portion of the unknown sample, the student observed a grayish precipitate. After adding a few drops of Mg(NO3)2 solution to another portion of the unknown sample, the student got a black precipitate. Based on these observations, what is the only possible ion in this student’s sample?

The ground-state valence-shell configuration of a particular atom is 5s2 4d10 5p1.  The element to which this atom belongs is a

Nitrous acid is a weak acid. What is the net ionic equation for the reaction that occurs between nitrous acid and strontium hydroxide?

Regarding the bedroom wing, ____________.

Which reactants must have reacted to form the products Ba(ClO4)2(aq) and 2H2O(l)?

The heating installation includes ___________.