Final Exam Review Quiz

According to the periodic table, how many neutrons are in a potassium atom that has an atomic mass of 41?

• 19

• 20

• 22

• 39

Which class of elements best conducts electricity?

• metals

• nonmetals

• semimetals

• noble (inert) gases

Generally, how do atomic masses vary throughout the periodic table of the elements?

• They increase from left to right and top to bottom.

• They increase from left to right and bottom to top.

• They increase from right to left and top to bottom.

• They increase from right to left and bottom to top.

Iodine would have chemical properties most like which of the following elements?

• manganese (Mn)

• tellurium (Te)

• chlorine (Cl)

• xenon (Xe)

According to the periodic table, which statement correctly describes the change from a neutral atom of an element to its ion?

• A fluorine atom forms a F^-1 ion by losing one electron.

• A sodium atom forms a Na^+1 ion by losing two electrons.

• A magnesium atom forms a Mg^+2 ion by gaining two electrons.

• A phosphorus atom forms a P^-3 ion by gaining three electrons.

Which elements have the same number of neutrons?

• (55Mn) and (56Fe)

• (55Mn) and (56Fe)

• (55Mn) and (56Fe)

• (55Mn) and (56Fe)

Which orbital notation shows the lowest energy arrangement of valence electrons for ( 1s^22s^22p^5 )?

• ( 2s ↑↓ ) ( 2p ↑ ) ( _ ) ( _ ) ( _ )

• ( 2s ↑↓ ) ( 2p ↑ ) ( ↑ ) ( _ ) ( _ )

• ( 2s ↑↓ ) ( 2p ↑ ) ( ↓ ) ( _ ) ( _ )

• ( 2s ↑↓ ) ( 2p ↑ ) ( _ ) ( _ ) ( ↓ )

Use the Periodic Table of the Elements to answer the question. Which element is least likely to give away electrons?

• fluorine

• lithium

• carbon

• neon

In which block does an element with the electron configuration [Xe] 6s²4f¹⁴5d¹⁰6p¹ belong?

• s block

• p block

• d block

• f block

Element X reacts with potassium (K) to produce the compound K₂X. The table below shows the number of valence electrons in four elements. Which element listed in the table is most likely element X?

• hydrogen

• nitrogen

• oxygen

• fluorine