Question

find aluminum in the periodic table. what is aluminums period and group?
□ period 1, group 6
□ period 13, group 3 (13)
□ period 3, group 3 (13)
□ period 6, group 8 (18)

Explanation:

To determine Aluminum's (Al) period and group in the periodic table:

• Period: The horizontal row. Aluminum has an atomic number of 13, with electrons in 3 energy levels (electron configuration: \(1s^2 2s^2 2p^6 3s^2 3p^1\)), so it is in Period 3.
• Group: The vertical column. Aluminum is in Group 13 (also labeled as Group 3 in some numbering systems, since \(13 - 10 = 3\) for main - group elements).

Now, let's analyze the options:

• "Period 1, Group 6": Incorrect. Period 1 has only H and He.
• "Period 13, Group 3 (13)": Incorrect. Periods are numbered 1 - 7, not 13.
• "Period 3, Group 3 (13)": Matches the analysis.
• "Period 6, Group 8 (18)": Incorrect. Period 6 has elements like Cs, Ba, etc., and Group 18 is noble gases.

Answer:

C. Period 3, Group 3 (13) (assuming the third option is labeled as C; if the original options have different labels, adjust the label but keep the text "Period 3, Group 3 (13)").