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NEET - Grade 11 - Chemistry - Classification of Elements and Periodicity in Properties - Importance and Snapshot of Classification of Elements and Periodicity in Properties - Study ref# 656

Introduction: In this Unit, we will study the historical development of the Periodic Table as it stands today and the Modern Periodic Law. We will also learn how the periodic classification follows as a logical consequence of atoms. Fi... read more

NEET - Grade 11 - Chemistry - Classification of Elements and Periodicity in Properties - Importance and Snapshot of Classification of Elements and Periodicity in Properties - Study ref# 657

Following sections must be covered to understand the Classification of Elements and Periodicity in Properties: 1. Why do we need to Classify Elements? 2. Genesis of Periodic Classification 3. Modern Law and the present form of the Peri... read more

NEET - Grade 11 - Chemistry - Classification of Elements and Periodicity in Properties - Target Setup for Classification of Elements and Periodicity in Properties - Study ref# 658

Student requires to achieve the following milestones to get better grip over Classification Of Elements And Periodicity In Properties. The milestones / targets are as follows:-Starting Point: Days 0Test TypeAppear on TestTarget TestsS... read more

NEET - Grade 11 - Chemistry - Classification of Elements and Periodicity in Properties - Study ref# 1259

What is the basic theme of organization in the Periodic Table? Answer: The basic theme of organization in the Periodic Table is to simplify and systematize the study of physical and chemical properties of all the elements and their innumerab... read more

NEET - Grade 11 - Chemistry - Classification of Elements and Periodicity in Properties - Study ref# 1260

What is the basic difference in approach between the Mendeleev’s periodic law and the modern periodic law? Answer: Mendeleev periodic law It states that the properties of the elements are a periodic function of their atomic weights. Modern p... read more

NEET - Grade 11 - Chemistry - Classification of Elements and Periodicity in Properties - Study ref# 1261

On the basis of quantum numbers, justify the sixth period of the Periodic Table should have 32 elements. Answer: In the modern Periodic Table, each period starts with the filling of a new principal energy level. Sixth period begins with fill... read more

NEET - Grade 11 - Chemistry - Classification of Elements and Periodicity in Properties - Study ref# 1262

Write the atomic number of the elements present in the third period and seventeenth group of the Periodic Table. Answer: General configuration for 17th group elements is. In the third period, the principal quantum number for valence shell is... read more

NEET - Grade 11 - Chemistry - Classification of Elements and Periodicity in Properties - Study ref# 1263

Which element do you think would have been named by (i) Lawrence Berkeley laboratory (ii) Seaborg’s group? Answer: (i) Lawrencium (Z=103) and Berkelium (Z=97). (ii) Seaborgium (Z=106).... read more

NEET - Grade 11 - Chemistry - Classification of Elements and Periodicity in Properties - Study ref# 1264

What does atomic radius or ionic radius mean to you? Answer: Atomic radius Atomic radius means size of the atom. It can be measured by X-ray or other spectroscopic methods. In case of non-metals, it is called covalent radius and if the element ... read more

NEET - Grade 11 - Chemistry - Classification of Elements and Periodicity in Properties - Study ref# 1265

What do you understand by isoelectronic species? Name a species that will be isoelectronic with each of the following atoms or ions. (i)             (ii)Ar                  (iii)         (iv)Rb+ Answer: Isoelectronic species have the sam... read more

NEET - Grade 11 - Chemistry - Classification of Elements and Periodicity in Properties - Study ref# 1266

Consider the following species:  and  (a) What is common in them? (b) Arrange them in order of increasing ionic radii. Answer: (i) Find number of electrons in each ion. For each positive charge remove one electron and for each neg... read more

NEET - Grade 11 - Chemistry - Classification of Elements and Periodicity in Properties - Study ref# 1267

Explain why cations are smaller and anions larger in radii than their parent atoms? Answer: Cations are always smaller in radii than their parent atoms because by the loss of one or two electrons effective nuclear charge increases. Due to th... read more

NEET - Grade 11 - Chemistry - Classification of Elements and Periodicity in Properties - Study ref# 1268

What are the various factors due to which the ionization enthalpy of the main group elements tends to decrease down a group? Answer: The ionization enthalpy of the main group elements decreases regularly on moving down the group due to the foll... read more

NEET - Grade 11 - Chemistry - Classification of Elements and Periodicity in Properties - Study ref# 1269

The first ionization enthalpy values (in kJ mol-1) of group 13 elements are   B                   Al               Ga                In                         TI  801                557             579               558               ... read more

NEET - Grade 11 - Chemistry - Classification of Elements and Periodicity in Properties - Study ref# 1270

Would you expect the second electron gain enthalpy of O as positive, more negative or less negative than the first? Justify you answer. Answer:                                                       When an electron is added to oxygen a... read more

NEET - Grade 11 - Chemistry - Classification of Elements and Periodicity in Properties - Study ref# 1271

What is the basic difference between the terms electron gain enthalpy and electronegativity? Answer: Electron gain enthalpy is the tendency of an isolated gaseous atom to accept an extra electron to from a gaseous anion while electronegativ... read more

NEET - Grade 11 - Chemistry - Classification of Elements and Periodicity in Properties - Study ref# 1272

What are the major differences between metals and non-metals? Answer: Metals are usually solids at room temperature (mercury is an exception, Gallium and caesium also have very low melting points). Metals usually have very high melting and b... read more

NEET - Grade 11 - Chemistry - Classification of Elements and Periodicity in Properties - Study ref# 1273

Explain why the electron gain enthalpy of fluorine is less negative than that of chlorine? Answer: Electron gain enthalpy of F is less negative than that of Cl because when an electron is added to F, the added electron goes to the smaller n=... read more

NEET - Grade 11 - Chemistry - Classification of Elements and Periodicity in Properties - Study ref# 1274

Nitrogen has positive electron gain enthalpy whereas oxygen has negative. However, oxygen has lower ionization enthalpy than nitrogen. Explain Answer: EC of  Nitrogen has stable configuration because p-orbital is half-filled. Therefore, ... read more

NEET - Grade 11 - Chemistry - Classification of Elements and Periodicity in Properties - Study ref# 1275

How does the metallic and non-metallic character vary on moving from left to right in a period? Answer: As we move from left to right in a period, the number of valence electrons increases by one at each succeeding element but the number of ... read more

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