Question

an atom has an outer shell electron configuration of 2s²2p⁶. which statements of the following are true regarding this configuration? select two correct answers. this represents an element with an incomplete oc valence electrons in its outermost energy level or this represents an element that is a noble gas. this represents an element from the alkali metals g this represents an element with a full outer energy shell of valence electrons. this represents an element that is a halogen

Explanation:

• Noble gases have a full outer shell of valence electrons. The electron configuration \(2s^{2}2p^{6}\) (total of \(2 + 6=8\) electrons in the outer shell) is characteristic of noble gases (e.g., neon has the electron configuration \(1s^{2}2s^{2}2p^{6}\)).
• An element with \(2s^{2}2p^{6}\) outer - shell configuration has \(2 + 6 = 8\) valence electrons, which means a full outer energy level (octet rule for second - shell elements).

Answer:

• This represents an element that is a noble gas.
• This represents an element with a full outer energy shell of valence electrons.