Chemistry CP Midterm Exam Review Guide
Periodic Table and Trends
1. The elements in the modern periodic table are arranged according to increasing ______________
number as a result of the work of Henry Moseley. This arrangement is based on the number of
__________________ in the nucleus of an atom of the element. The modern form of the periodic
table results in the periodic law, which states that when elements are arranged according to
increasing atomic number, there is a periodic repetition of their chemical and physical
2. Which has the largest atomic radius: carbon (C), fluorine (F), beryllium (Be), or lithium (Li)?
3. Explain your answer in terms of trends in atomic radii.
4. Describe ionization energy trends on the periodic table by completing the statements below.
a. Ionization energy generally ______________ as you move left-to-right across a
______________. Increased nuclear charge leads to increased __________________
attraction on valence electrons.
b. Ionization energy generally _______________ when you move down a ____________. Less
energy is required to remove _______________ electrons because they are
_______________ from the nucleus.
c. The Octet Rule states that atoms tend to gain, lose, or share _______________ in order to
acquire a full set of _______________________. First period elements are the
_______________ to this rule.
Ionization energy is the amount of energy required to remove an electron from an atom.
Knowing this, look at the following successive ionization energies (in
) for an element.