Question

topic5 d4 assessment periodic table
7 of 42

1. atoms of elements in group i have _.

o two electrons in their outermost energy level
o seven electrons in their outermost energy level
o eight electrons in their outermost energy level
o one electron in their outermost energy level

Explanation:

In the periodic table, group 1 elements (alkali metals) have one electron in their outermost energy level. For example, sodium (\(Na\)) has an electron configuration of \(1s^{2}2s^{2}2p^{6}3s^{1}\), where the outermost \(3s\) orbital has one electron.

• Option 1: Two electrons in the outermost energy level is characteristic of group 2 elements (alkaline - earth metals).
• Option 2: Seven electrons in the outermost energy level is for group 17 (halogens).
• Option 3: Eight electrons (a full outer shell) is for noble gases (group 18, except helium which has 2 electrons in its only shell).

Answer:

one electron in their outermost energy level.