10. Periodic Properties of the Elements

How many unpaired electrons are present in the ground state of a group 16 (6A) element, such as oxygen (O)?

If an atom has 6 valence electrons, which element is it most likely to be?

Which of the following is the best method to determine the number of valence electrons in a neutral atom of a main group element?

How many valence electrons are present in the polyatomic ion PO_3^{3-}?

Which statement describes the valence electrons in ionic bonds?

How many valence electrons does a magnesium atom have?

Oxygen has an atomic number of 8 and an atomic mass of 16. How many valence electrons does it have?

Why is the configuration of electrons in an atom's outer shell important?

How many valence electrons does an atom of neon (Ne) have?

The first electron shell of an atom can hold a maximum of two electrons. How does this explain the valence of hydrogen?

An atom has the electron configuration 1s2 2s2 2p3. How many valence electrons does this atom have?

Which of the following represents the valence electron configuration for a beryllium (Be) atom?

How many valence electrons does magnesium (Mg) have?

How many valence electrons does a sulfur (S) atom have?

Which subshell holds the valence electrons of barium (Ba)?