Question

1. use the periodic table to choose the best answer to find the electron configuration for silicon.

which element would be used for shorthand electron configuration for silicon?
ar
he
kr
ne

1. use the periodic table to choose the best answer.

which of these elements has a lower electronegativity?
radium
barium

Explanation:

Question 8

Silicon (\(Si\)) has an atomic number of \(14\). The noble - gas shorthand electron configuration uses the noble gas from the previous period. Neon (\(Ne\)) has an atomic number of \(10\). The electron configuration of \(Si\) is \([Ne]3s^{2}3p^{2}\). Argon (\(Ar\)) has an atomic number of \(18\) (too high), helium (\(He\)) has an atomic number of \(2\) (too low), and krypton (\(Kr\)) has an atomic number of \(36\) (way too high).

Electronegativity generally increases across a period and decreases down a group. Radium (\(Ra\)) is in Group 2 and Barium (\(Ba\)) is also in Group 2. Radium is below Barium in the group. Since electronegativity decreases down a group, Radium has a lower electronegativity.

Answer:

\([Ne]\)

Question 9