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Chemistry Classification and Periodicity Quiz

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Chemistry Classification and Periodicity Quiz

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Questions and Answers

What is the equation, with state symbols, which represents the first ionization energy of arsenic?

$As(g) ightarrow As^+(g) + e^-$ (correct)

$As(g) + energy ightarrow As^+(g) + e^-$

$As^+(g) ightarrow As(g) + e^-$

$As(g) + e^- ightarrow As^-(g)$

What is the electronic configuration for an arsenic atom using the electrons-in-boxes notation?

1s22s22p63s23p64s23d104s24p3

1s22s22p63s23p63d104s23p4 (correct)

1s22s22p63s23p63d104s24p3

1s22s22p63s23p64s23d104p3

Why is the first ionization energy of selenium lower than that of arsenic?

Selenium has more electron shielding than arsenic (correct)

Selenium has a smaller atomic radius than arsenic

Selenium has a larger atomic radius than arsenic

Selenium has fewer electron shells than arsenic

Explain why the first ionization energy of krypton is higher than that of selenium.

Krypton has a smaller atomic radius than selenium Signup and view all the answers

Which of the elements, arsenic to rubidium, is likely to have atoms with the smallest atomic radius?

Rubidium Signup and view all the answers

Why is it necessary to study the chemical and physical properties of each element?

To understand the potential uses and dangers associated with each element Signup and view all the answers

What was the main reason for scientists to classify the elements?

To facilitate the study of the chemistry of a large number of elements and their compounds Signup and view all the answers

How many elements were known by 1865?

63 Signup and view all the answers

What is the significance of the increasing number of identified elements over time?

It reflects the continuous discovery of new elements Signup and view all the answers

What is the relevance of studying the chemistry of all the elements and their compounds?

Understanding the diverse roles and impacts of each element in our lives Signup and view all the answers