10. Periodic Properties of the Elements

How many valence electrons does the S^{2-} ion have? (Hint: Write out the electron configuration of S^{2-}.)

Which of the following best describes a valence electron and its importance in chemistry?

Which of the following best defines valence in chemistry?

How many valence electrons are present in a molecule of CO_2?

Which of the following elements has more core electrons than valence electrons?

Where are the elements with the most valence electrons located on the periodic table?

Which of the following best explains why the valency of carbon is 4, even though it has 6 electrons?

Which of the following represents the number of valence electrons in an oxygen (O) atom?

Which of the following correctly states the number of valence electrons in H2S and provides the correct Lewis structure for the molecule?

How many valence electrons does the element lithium (Li) have?

How many valence electrons does an oxygen atom possess?

How many valence electrons does a fluorine atom have?

How many valence electrons does boron (B) have?

How many valence electrons does a fluorine atom have?

How many valence electrons do alkaline earth metals have?