Question

Which valence shell electron arrangement is that of a metallic element?

• A. $2,1$
• B. $2,4$
• C. $2,5$
• D. $2,7$

Answer 1

Answer: (A)

$2,1$

The valence shell electron arrangement $2,1$ is that of a metallic element. The valence shell has 2 electrons in s subshell and 1 electron in p subshell. It can easily lose 3 electrons to form $M^{3+}$ ion. An example is aluminium metal. Metals belonging to s or p block of periodic table have upto 3 valence electrons.