What is the difference between a period and a group in the periodic table?

2 answers:

6 0

A period is horizontal; the elements gain 1 proton for each space moving left to right.
A group is vertical; the elements in each group have the same number of electrons in the valence shell(outer orbital).

Alexeev081 [22]3 years ago

3 0

In the periodic table, the vertical columns are called the “groups” or sometimes referred as “families.” They are called this because they have similar chemical properties. The horizontal rows on the period table are called periods because they all have same exact number of electron shells.

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How does the freezing and boiling point of ocean water compare to those of distilled water?

vichka [17]

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8 0

4 years ago

Which 2 resonance forms destablize the carbocation intermediate if bezonitrile undergoes chlronation at the ortho or para positi

Anna11 [10]

The question is incomplete, the complete question is shown in the image attached

Answer:

A and B

Explanation:

The electrophilic substitution of arenes yields a cation intermediate. The positive charge of the cation is delocalized over the entire ring.

The -CN group directs incoming electrophiles to the ortho/para position. The resonance structures for the chlorination of benzonitrile are shown in the question.

Recall that -CN is an electron withdrawing group. The resonance forms that destablize the carbocation intermediate are those in which the -CN group is directly attached to the carbon atom bearing the positive charge as in structures A and B.