10. Periodic Properties of the Elements

How many valence electrons does an atom of an element in group 15 of the periodic table have?

How many valence electrons are present in a molecule of NH_3 (ammonia)?

Which element has 7 valence electrons in its 5th energy level?

Which of the following represents the valence electron configuration for the helium atom?

Which term is used to describe electrons located in the outermost energy level of an atom?

Which element has exactly 2 valence electrons and only 1 energy level?

Which of the following represents the valence electron configuration for a chlorine (Cl) atom?

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

How many valence electrons does an atom of calcium (Ca) have?

How many valence electrons does arsenic (As) have?

Which of the following is the number of valence electrons in a neutral atom of selenium (Se)?

In which electron shell are the valence electrons of gallium (Ga) located?

How many valence electrons are present in the electron-dot (Lewis) structure of carbon tetrachloride (CCl_4)?

How many electrons are present in the third shell (n = 3) of a sodium (Na) atom in its ground state?