6.2 Classification of Elements

Why are both hydrogen and cesium s-block elements, when hydrogen has one electron and cesium has 55?

• All blocks contain at least one element from each period.

• Blocks of elements on the periodic table are based only on an element's valence electrons.

• The s-block includes only the most reactive elements.

• They have identical electron configurations.

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Atoms of elements in group 1 have ____________.

• one electron in their outermost energy level

• two electrons in their outermost energy level

• seven electrons in their outermost energy level

• eight electrons in their outermost energy level

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Which of the blocks on the periodic table contains the most elements?

• s block

• p block

• d block

• f block

What makes the d block wider than either the s block or the p block?

• The d sub-orbital can hold ten electrons, making the d block ten elements wide.

• The d block is the most researched area of the periodic table.

• The elements in the d block are more important than the elements in the rest of the table.

• The elements in the d block are all metals.

From the table below, determine the atomic number of the noble gas at the end of period 5.

• 18

• 36

• 54

• 52

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What is the heaviest metalloid:

• Boron

• Radon

• Polonium

• Tellurium

Shiny (luster) and good conductors of electricity:

• Nonmetal

• Lightning

• Metal

• Semi-metal

The atoms along the staircase are called 

• metals
• nonmetals
• metalloids
• noble gases

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Which element has n=2 and s² p⁶ configuration?

• He

• O

• Ne

• Ni

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How many valence electrons does an atom of sulfur (S) have?

• 2
• 3
• 6
• 16

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