Chapter 5 ACP Chemistry

Within a period of elements, as the atomic number increases, the ionization energy…

• Generally Increases

• Generally Decreases

• Decreases, irregularly

• Net Neutral

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The most characteristic property of the noble gases is that they are

• Metallic

• Radioactive

• Metalloids

• Generally Unreactive

Elements in a group or column of the periodic table can be expected to have similar

• Atomic Masses

• Atomic Numbers

• Properties

• Number of Nuetrons

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The number of valence electrons for Group 14 elements is

• 2

• 14

• 4

• Equal to the period Number

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Helium is placed away from the other s-block elements because

• It has similar properties to noble gases

• It has similar properties to Ca

• It has 2 protons

•  It is an unstable s-black element

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A common ion is...

• Typically rare for most elements

• The ion that is most common for an element

• Reflects the number of protons that are shared between atoms

• Is the same as the cation for all elements

Which of the following is a cation (record all letters that apply)

• Ca

• I^-

• As^-3

• K^+

The element that has the greatest electronegativity is

• Oxygen

• Fluorine

• Hydrogen

• Argon

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Who determined the atomic number for elements and arranged the periodic table accordingly in 1911?

• Mendeleev

• Mosely

• Einstein

• Bohr

What is the primary reason atomic radius decreases across a period?

• Decrease in nuclear charge

• Increased number of energy levels

• Increased positive charge of the nucleus

• Decreased electron affinity