Question

question 28 (1 point)
which of the following is true about the electron configurations of the representative elements?
o a the electrons with the highest energy are in an f sublevel.
o b the highest occupied s and p sublevels are completely filled.
o c the electrons with the highest energy are in a d sublevel.
o d the highest occupied s and p sublevels are partially filled.

question 29 (1 point)
of the elements fe, hg, u, and te, which is a representative element?
o a u
o b fe
o c hg
o d te

question 30 (1 point)
the metals in groups 1a, 2a, and 3a
o a gain electrons when they form ions.
o b all form ions with a negative charge.
o c all have ions with a 1* charge.
o d lose electrons when they form ions.

Explanation:

• Question 28: Representative elements (also known as main - group elements) have their highest - energy electrons in \(s\) and \(p\) sublevels. The highest - occupied \(s\) and \(p\) sublevels are partially filled. For example, in Group 1A (alkali metals), the \(s\) sublevel has 1 electron (\(ns^{1}\)), in Group 2A (\(ns^{2}\)), in Group 3A (\(ns^{2}np^{1}\)) etc.
• Question 29: Representative elements are in Groups 1A - 8A. \(Fe\) (iron) is a transition metal (d - block element), \(Hg\) (mercury) is also a transition metal, \(U\) (uranium) is an actinide (f - block element). \(Te\) (tellurium) is in Group 6A, which is a representative element group.
• Question 30: Metals in Groups 1A, 2A, and 3A are electropositive. They lose electrons to form cations. Group 1A metals lose 1 electron (\(M^{+}\)), Group 2A metals lose 2 electrons (\(M^{2 +}\)), and Group 3A metals lose 3 electrons (\(M^{3+}\)). They do not gain electrons (non - metals gain electrons to form anions in general), and their ions have positive charges.

Answer:

• Question 28: d. The highest occupied \(s\) and \(p\) sublevels are partially filled.
• Question 29: d. Te
• Question 30: d. lose electrons when they form ions.