Periodic Table Groups Quiz
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Questions and Answers

How many numbered groups are there in the periodic table?

18

What dominates most chemical properties in a group?

the orbital location of the outermost electron

When was the modern numbering system of 'group 1' to 'group 18' recommended by IUPAC?

since 1988

What are the two older incompatible naming schemes replaced by the modern numbering system?

<p>the naming schemes used by the Chemical Abstract Service (CAS) and by IUPAC before 1988</p> Signup and view all the answers

What causes some dissent in the chemistry community about the membership of elements number 1 and 2?

<p>Similar variation on the inner transition metals</p> Signup and view all the answers

Who discovered the periodic trends in the periodic table?

<p>Dmitri Mendeleev</p> Signup and view all the answers

What is the relationship between atomic radius and the position of elements in the periodic table?

<p>Atomic radius decreases from left to right in a period and increases when moving down a group.</p> Signup and view all the answers

How do valence electrons influence the atomic radius in a period?

<p>The valence electrons being in the same outermost shell in a period cause the atomic radius to decrease.</p> Signup and view all the answers

What effect does the increase in atomic number within a period have on the atomic radius?

<p>The increase in atomic number within a period increases the effective nuclear charge, leading to a reduction in the atomic radius.</p> Signup and view all the answers

Why does the atomic radius increase when moving down a group in the periodic table?

<p>The atomic radius increases when moving down a group due to the addition of a new shell.</p> Signup and view all the answers

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