Module 2 Chemistry Review

Sodium (Na) and potassium (K) are in the same group on the periodic table. Based on their locations, which statement about sodium and potassium is true?

• Sodium is less electronegative than potassium. 

• Sodium has fewer energy levels than potassium. 

• Sodium has a larger ionic radius than potassium. 

• Sodium has lower ionization energy than potassium. 

Which of these elements has the greatest atomic radius? 

• H

• N

• Cl

• Cs

The Periodic Table of the Elements is useful for revealing patterns and trends in the elements. Which statement accurately describes a pattern in the size of atomic radii in the Periodic Table of the Elements?

• Atomic radii decrease from left to right across a period and decrease from top to bottom in a group.

• Atomic radii increase from left to right across a period and increase from top to bottom in a group.

• Atomic radii decrease from left to right across a period and increase from top to bottom in a group.

• Atomic radii increase from left to right across a period and decrease from top to bottom in a group.

The ionization potential of an element is the amount of energy required to remove an electron from an isolated atom or molecule. According to the periodic table, which of the following indicates the correct decreasing order of ionization energy?

• Li > Na > K > Cs

• Na > K > Li > Cs

• Li > K > Na > Cs 

• Cs > K > Na > Li 

The number of valence electrons in an element affects the reactivity of that element. Which element listed has the fewest valence electrons?

• beryllium (Be)

• sodium (Na) 

• oxygen (O) 

• neon (Ne)

The period for Bromine is ___________.

• 3

• 2

• 4

Beryllium is in group number______.

• Group 2

• Group 3

• Group 4

• Group 7

Elements in the same ________ are more chemically similar.

• group

• period

• club

• table

The majority of elements on the periodic table are

• man made.

• nonmetals.

• metals.

• gases.

Name group 17 on the periodic table.

• noble gasses

• metalloids

• halogens

• alkali metals