Unit 2- Periodicity Exam Review

What can you infer about elements that are in the

same group?

• They will have the similar chemical properties.

• They will contain the same number of protons.

• They will display similar atomic masses.

• They will emit X rays of similar frequency.

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Which of the following groups/families contain at least

one element that is gaseous at room temperature?

• alkali metals and alkaline earth metals

• alkali metals and transition metals

• noble gases and transition metals

• noble gases and halogens

Why did Mendeleev switch the order of some elements

in his periodic table?

• He determined that the atomic masses were

  incorrect.

• He decided that elements should be placed in order

  of atomic mass even if this meant placing elements

  with different properties in the same group.

• He decided that elements should be grouped based

  on properties even if this meant placing elements

  out of order by atomic mass.

• He determined that elements should be placed in

  order of increasing atomic number.

When this element was discovered, it exhibited luster

and malleability, and it reacts vigorously with water. This

element is never found as a free element in nature and

always exists in a compound. To which group does this

element most likely belong?

• alkali metals

• halogens

• noble gases

• transition metals

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The periods and groups on the periodic table are

numbered. For example, the element neon (Ne) is in

period 2, group 18. Neon is an inert gas and therefore

does not react readily with any other element. Which of

the following elements is likely to have properties similar

to those of neon?

• lithium (Li) in period 2, group 1

• boron (B) in period 2, group 13

• iron (Fe) in period 4, group 8

• krypton (Kr) in period 4, group 18

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Atoms of the noble gases are generally not reactive

because-

• they are neutral atoms

• they are charged

• their outer electron (valence) level is filled

• they are too large to react

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Mendeleev left gaps in his periodic table because

• the table was too small

• the table was too full

• no known elements fit there

• some elements had more than one isotope

Atoms in the same family on the periodic table have

____ numbers of valence electrons and _____ properties.

• different, different

• different, similar

• similar, similar

• similar, different

Which of the following trends can be identified on the

periodic table?

• atomic radii increase from left to right across a period

• ionization energy increases from top to bottom within

  a family

• electronegativity decreases from left to right across a

  period

• atomic radii increase from top to bottom of a group

In general ionization ____ as you go down a group,

and ____ as you go across the periodic table.

• decreases, decreases

• decreases, increases

• increases, decreases

• increases, increases

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