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