Boron (B) and aluminum (Al) are both in Group 3A. This is because

• Boron (B) and aluminum (Al) have three electrons in their highest energy level.

• Boron (B) and aluminum (Al) end with p orbitals.

• Boron (B) and aluminum (Al) have the same valence shell.

• Boron (B) and aluminum (Al) are metals.

• The highest energy level (n) of an atom that contains electrons is the _____.

The electrons residing in the highest energy level are called __________.

The valence shell of an atom with an electron configuration of 1s²2s²2p⁶3s¹ is _____.

The valence electrons of an atom with an electron configuration of 1s²2s²2p⁶3s²3p¹ is _____.

To which period in the periodic table does an atom with an outer electron configuration of 3p⁶4s¹ belong?

• 1

• 6

• 3

• 4

To which group in the periodic table does an atom with electron configuration of 1s²2s²2p⁶3s¹ belong?

• 1

• 2

• 3

• 6

To which group in the periodic table does an atom with outer electron configuration of 3s²3p¹ belong?

To what period in the periodic table do elements with valence shell of 5 belong?

To what group in the periodic table do elements with valence electrons of 4 belong?