Question

example:
elements in group 2 will
have — valence electrons.
elements in group 17 will
have — valence electrons.
atoms aim to have a full outer shell of electrons - usually —.
this desire to have 8 electrons in their outer energy level is called the —.

Explanation:

• The octet rule states that atoms aim to have a full outer shell of electrons (usually 8 electrons), and the electrons in the outer energy level are called valence electrons.
• Group 2 elements have 2 valence electrons (e.g., Mg has 2 valence electrons).
• Group 17 elements (halogens) have 7 valence electrons (e.g., Cl has 7 valence electrons).

Answer:

• "This desire to have 8 electrons in their outer energy level is called the octet rule."
• "Atoms aim to have a full outer shell of electrons - usually 8."
• "Elements in Group 2 will have 2 valence electrons."
• "Elements in Group 17 will have 7 valence electrons."