On the periodic table, lithium and beryllium are in different groups. Which statement describes why the two elements are in different groups?(1 point) Responses They are different colors. They are different colors. They have a different number of electron shells. They have a different number of electron shells. They have a different number of electrons in their outer shells. They have a different number of electrons in their outer shells. They have different atomic numbers.
They have a different number of electrons in their outer shells.
The statement that describes why lithium and beryllium are in different groups on the periodic table is: They have a different number of electrons in their outer shells.
The correct statement that describes why lithium and beryllium are in different groups on the periodic table is: They have a different number of electrons in their outer shells.
To determine the number of electrons in an element's outer shell, you can look at their electron configuration or the group number they are in. The group number of an element indicates the number of valence electrons it has, which are the electrons in the outermost shell. Lithium (Li) is in Group 1, which means it has 1 electron in its outer shell. Beryllium (Be) is in Group 2, indicating it has 2 electrons in its outer shell. Since they have a different number of electrons in their outer shells, lithium and beryllium are placed in different groups on the periodic table.