Honors Unit 3 Periodicy and Trends

Who is credited with creating the first version of the periodic table?

• Moseley
• Newlands
• Mendeleev
• Seaborg
• Lavoisier

Answer explanation

Mendeleev arranged elements by increasing atomic mass and predicted missing elements.

How did Moseley revise the periodic table?

• Used atomic mass
• Grouped by density
• Used atomic number
• Sorted by reactivity
• Included isotopes

Answer explanation

Moseley discovered atomic number defines the periodic law.

What law states that properties of elements recur periodically when arranged by increasing atomic number?

Answer explanation

The periodic law governs element patterns based on atomic number.

Which element group is entirely nonmetals?

• Alkali metals
• Transition metals
• Halogens
• Actinides
• Metalloids

Answer explanation

Halogens (Group 17) are all nonmetals.

What block does the element calcium belong to?

• s-block
• p-block
• d-block
• f-block
• g-block

Answer explanation

Ca is an alkaline earth metal in the s-block.

Which of the following are found in the p-block?

• Halogens
• Alkali metals
• Noble gases
• Metalloids
• Transition metals

Answer explanation

Halogens, noble gases, and metalloids reside in the p-block.

Identify all s-block elements.

• Li
• Na
• Mg
• Al
• Be

Answer explanation

All are s-block except Al (p-block).

What defines the d-block elements?

• Nonmetals
• Metals in groups 3–12
• Noble gases
• Alkaline earth metals
• f-orbitals

Answer explanation

D-block includes metals from Groups 3–12.

Which elements are in the f-block?

• Alkali metals
• Metalloids
• Actinides and lanthanides
• Halogens
• Transition metals

Answer explanation

f-block contains inner transition metals.

What are metalloids?

• Elements that are gases at room temperature
• Elements with properties of both metals and nonmetals
• Only found in the p-block
• Highly reactive metals
• f-block elements

Answer explanation

Metalloids show both metallic and nonmetallic traits.