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Chemistry Unit 3: Classification of Elements and Periodicity in Properties

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Chemistry Unit 3: Classification of Elements and Periodicity in Properties

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Questions and Answers

Which criterion is used to classify elements into s, p, d, f blocks?

Number of neutrons

Atomic mass

Energy sublevels in which the valence electrons are found (correct)

Number of protons

What does the Periodic Law state?

Elements with lower atomic numbers have higher electronegativity

Elements with similar properties have consecutive atomic numbers

Elements with higher atomic numbers have lower reactivity

Elements with consecutive atomic numbers have similar properties (correct)

How does ionization enthalpy relate to metallic character?

Ionization enthalpy has no relation to metallic character

Higher ionization enthalpy corresponds to greater metallic character

Metallic character decreases with decreasing ionization enthalpy

Lower ionization enthalpy corresponds to greater metallic character (correct)

What is the most important concept in chemistry, according to the text?

The Periodic Table Signup and view all the answers

Who profounded the Law of Octaves in 1865?

John Alexander Newlands Signup and view all the answers

Why is awareness of the Periodic Table essential?

To understand the fundamental building blocks of chemistry Signup and view all the answers

What did Johann Dobereiner consider in the early 1800s?

Trends among properties of elements Signup and view all the answers

How many elements were known in 1800?

31 Signup and view all the answers

What was the main contribution of Glenn T. Seaborg?

Demonstrating that chemical elements display trends and lie together in families Signup and view all the answers

What did John Alexander Newlands arrange in his Law of Octaves?

Elements in increasing order of atomic weights Signup and view all the answers

Why did scientists search for a systematic way to organize their knowledge by classifying the elements?

To rationalize known chemical facts about elements and predict new ones for further study Signup and view all the answers

What was the relationship noted by John Alexander Newlands in his Law of Octaves?

Every eighth element had properties similar to the first element Signup and view all the answers

What was the main idea behind Johann Dobereiner's work?

Trends among properties of several groups of three elements (Triads) Signup and view all the answers

What was the consequence of systematizing the knowledge gained by a number of scientists through their observations and experiments?

The classification of elements into groups and development of Periodic Law and Periodic Table Signup and view all the answers