May 25

Which pair of elements has the most similar properties?

• Li and B
• I and Ca
• K and He
• N and P

Which statement best explains how periods on the periodic table are organized?

• increasing atomic number from left to right
• increasing number of neutrons from left to right
• decreasing number of electrons from left to right
• decreasing atomic mass number from left to right

Where are the most reactive metals located on the periodic table?

• the uppermost complete row of the table
• the rows at the bottom of the table connecting two section
• the column at the far left side of the table
• the second column from the right side of the table

Sodium reacts with water. Which element is most likely to have a similar effect to sodium if it is exposed to water?

• carbon
• oxygen
• lithium

Which elements are most likely to react in the same manner in a chemical reaction?

• elements in the same group
• elements in the same period
• elements with similar atomic masses

If an element has no electrons to share and is stable, what family is it found in?

• alkali metals
• noble gases
• halogens

Why are certain elements placed into the same column on the periodic table?

• They have the same number of protons in their nuclei.
• They have the same number of electrons in their nuclei.
• They have the same number of electrons in their outer energy level.

Which property is unique for each element?

• mass number
• atomic number
• state of matter

Which elements would have similar properties to those of potassium?

• lithium and sodium
• bromine and krypton
• calcium and scandium

Which best describes how the current periodic table is arranged?

• by atomic mass
• by atomic number
• in alphabetical order by element symbol
• in numerical order by number of neutrons in the nucleus