Question

identify these elements based on their locations in the periodic table. give the symbol, not the name.
period 4, group 14 (4a)
period 5, group 12 (2b)
period 4, group 16 (6a)

Explanation:

For period 4, group 14 (4A):

Step1: Recall period and group meaning

Period 4 means the 4th row (n=4), group 14 (4A) has elements with valence electrons in \(n s^2 n p^2\). The element in period 4, group 14 is Germanium.

Step2: Get the symbol

Symbol of Germanium is Ge.

For period 5, group 12 (2B):

Step1: Recall period and group meaning

Period 5 (n=5), group 12 (2B) elements have \(d^{10} s^2\) configuration. The element in period 5, group 12 is Cadmium.

Step2: Get the symbol

Symbol of Cadmium is Cd.

For period 4, group 16 (6A):

Step1: Recall period and group meaning

Period 4 (n=4), group 16 (6A) has elements with \(n s^2 n p^4\) valence electrons. The element in period 4, group 16 is Selenium.

Step2: Get the symbol

Symbol of Selenium is Se.

Answer:

period 4, group 14 (4A): Ge
period 5, group 12 (2B): Cd
period 4, group 16 (6A): Se