10. Periodic Properties of the Elements

How many valence electrons does a nitrogen atom have?

For a sodium atom (Na), in which principal energy level are the valence electron(s) found?

Why are valence electrons important in chemistry?

In an atom, what are the electrons located in the outermost shell called?

Which part of an atom is primarily responsible for its chemical reactivity during a chemical process?

Which region of the periodic table contains atoms with the greatest number of valence electrons?

Which pair of elements has the same number of valence electrons?

How many valence electrons does silicon (Si) have?

Which part of an atom is primarily involved in chemical reactions?

Which of the following groups of elements have their valence electrons within the same principal energy level?

How many valence electrons does chromium (Cr) have in its ground state?

What does the number of electrons in an atom's valence shell determine?

How many valence electrons are present in a neutral atom of strontium (Sr)?

How many valence electrons does gallium (Ga) have?

Which of the following is the best way to determine the number of valence electrons in a main-group element?