Question

question 29 (1 point) of the elements fe, hg, u, and te, which is a representative element? a hg b fe c te d u question 30 (1 point) the metals in groups 1a, 2a, and 3a a lose electrons when they form ions. b all have ions with a 1* charge. c all form ions with a negative charge. d gain electrons when they form ions. question 31 (1 point) which of the following factors contributes to the decrease in ionization energy within a group in the periodic table as the atomic number increases? a increase in number of protons b increase in size of the nucleus c increase in atomic size d fewer electrons in the highest occupied energy level

Explanation:

Question 29

• Representative elements are in groups 1A - 8A.
• Fe (Iron) is a transition metal (group 8B).
• Hg (Mercury) is a transition metal (group 2B).
• U (Uranium) is an actinide (inner - transition metal).
• Te (Tellurium) is in group 6A (a representative element group).

• Metals in groups 1A, 2A, and 3A are more likely to lose electrons to form cations (positive ions).
• Group 1A metals form + 1 ions, group 2A form + 2 ions, group 3A form + 3 ions.
• Non - metals gain electrons to form anions (negative ions), but these are metals.

• Ionization energy is the energy required to remove an electron.
• As atomic size increases (down a group), the outermost electrons are farther from the nucleus.
• The attraction between the nucleus and the outermost electrons decreases, so less energy is needed to remove the electron.
• Increase in protons (a) and nucleus size (b) would, in isolation, increase the attraction for electrons (opposite of what we want for decreasing ionization energy).
• The number of electrons in the highest occupied energy level (d) is the same within a group.

Answer:

C. Te

Question 30