2.3a Periodic Properties of the Elements

What is the atomic radius of an element equal to?

• Distance between the centers of two atoms in contact

• Distance between the nucleus and the outermost electron

• Diameter of a single atom

• Distance between the centers of two atoms not in contact

What happens to the atomic radius as we move from left to right across a period?

• It remains constant

• It increases

• It decreases

• It fluctuates randomly

What happens to the atomic radius as we move down a group?

• It decreases

• It increases

• It remains constant

• It fluctuates randomly

Which element possesses the largest atomic radius in the periodic table?

• Cesium (Cs)

• Rubidium (Rb)

• Potassium (K)

• Sodium (Na)

What is the general trend for ionic radii of nonmetals close to the metalloid line?

• They fluctuate randomly

• They are larger than other nonmetals

• They remain constant

• They are smaller than other nonmetals

What is the general trend for ionic radii of metals closer to the metalloid line?

• They are larger than other metals

• They fluctuate randomly

• They are smaller than other metals

• They remain constant

Which metalloid behaves more like a nonmetal?

• Boron (B)

• Tellurium (Te)

• Germanium (Ge)

• Silicon (Si)

What is the atomic number of cesium (Cs), which possesses the largest atomic radius in the periodic table?

• 58

• 57

• 56

• 55

What is the atomic number of helium (He), which possesses the smallest atomic radius in the periodic table?

• 3

• 4

• 2

• 1

What is the Zeff trend as we move across a period from left to right?

• It increases

• It remains constant

• It decreases

• It fluctuates randomly