Modern Periodic Table and Elements Worksheet

What group of elements did William Ramsey discover?

• Noble gases

• Alkali metals

• Transition metals

• Halogens

What did Mendeleev do when he noticed gaps in his Periodic Table?

• He left gaps for elements that had yet to be discovered.

• He removed those elements.

• He changed the order of the elements.

• He ignored the gaps.

According to Moseley, what determines the chemical properties of elements?

• Atomic number

• Atomic mass

• Number of neutrons

• Number of electrons

Which element in the table is a very reactive non-metal with a mass of 19?

• Fluorine

• Chlorine

• Oxygen

• Bromine

What is the mass of Aluminum as shown in the table?

• 27

• 28

• 31

• 70

Based on the table, what is the mass of Phosphorus?

• 31

• 32

• 14

• 75

Which element is described as an unreactive metal with a mass of 70?

• Gallium

• Aluminum

• Arsenic

• Boron

What is the position of the unknown element in the table?

• Between Silicon and Arsenic

• Between Boron and Carbon

• Between Oxygen and Fluorine

• Between Sulfur and Chlorine

What is the mass of the element directly above the unknown element in the table?

• 28

• 12

• 31

• 75

Which element is a metalloid with a mass of 75?

• Arsenic

• Silicon

• Boron

• Gallium