Forum

Jaiyush19
Jaiyush19
@jaiyush19
Forum Home   |   Recent Posts
Illustrious Member
Joined: Sep 10, 2021
Last seen: Jul 13, 2023
Profile Activity
Topics: 2159 / Replies: 16
AllTopicsReplies
Topic
Can the following groups of elements be classified as Dobereiner’s triads? (a) Na, Si, Cl (b) Be, Mg, Ca Give reason for your answer.
4 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 317
Topic
In the following set of elements, one element does not belong to the set. Select this element and state why it does not belong: Oxygen, Nitrogen, Carbon, Chlorine, Fluorine
4 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 321
Topic
In the following set of elements, one element does not belong to the set. Select this element and explain why it does not belong: Calcium, Magnesium, Sodium, Beryllium
4 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 115
Topic
The atomic masses of three elements X, Y and Z having similar chemical properties are 7, 23 and 39 respectively. (a) Calculate the average atomic mass of elements X and Z. (b) How does the average atomic mass of elements X and Z compare with the at...
4 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 272
Topic
State modern periodic law. (b) How does the electronic configuration of the atom of an element relate to its position in the modern periodic table? (c) How could the modern periodic law remove various anomalies of Mendeleev’s periodic table? Explai...
4 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 250
Topic
State Mendeleev’s periodic law. (b) What chemical properties of elements were used by Mendeleev in creating his periodic table? (c) State any three limitations of Mendeleev’s classification of elements.
4 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 290
Topic
Why do we classify elements? (b) What were the two criteria used by Mendeleev to classify the elements in his periodic table? (c) Why did Mendeleev leave some gaps in his periodic table?
4 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 239
Topic
How do the properties of eka-aluminum element predicted by Mendeleev compare with the actual properties of gallium element? Explain your answer. (b) What names were given by Mendeleev to the then undiscovered elements
4 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 250
Topic
State the merits of Mendeleev’s classification of elements. (b) Describe two anomalies of Mendeleev’s periodic classification of elements.
4 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 244
Topic
State the periodic law on which Mendeleev’s periodic table was based. Why and how was this periodic law changed? (b) Explain why, the noble gases are placed in a separate group.
4 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 99
Topic
Did Dobereiner’s triads also exist in the columns of Newlands’ law of octaves? Explain your answer. (b) What were the limitations of Dobereiner’s classification of elements?
4 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 265
Topic
What is Newlands’ law of octaves? Explain with an example.
4 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 132
Topic
What is Debereiner’s law of triads? Explain with the help of one example of a Dobereiner’s triad.
4 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 140
Topic
Name three elements that have a single electron in their outermost shells. (b) Name two elements that have two electrons in their outermost shells. (c) Name three elements with completely filled outermost shells.
4 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 131
Topic
On which side of the periodic table will you find metals? (b) On which side of the periodic table will you find non-metals? (c) What is the name of those elements which divide metals and non-metals in the periodic table?
4 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 135
Topic
How were the positions of isotopes of an element decided in the modern periodic table? (b) How were the positions of cobalt and nickel resolved in the modern periodic table?
4 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 267
Topic
In the modern periodic table, which are the metals among the first ten elements? (b) What is the significance of atomic number in the modern classification of elements? Explain with the help of an example.
4 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 93
Topic
What is meant by (i) a group, and (ii) a period, in a periodic table? (b) How many periods and groups are there in the long form of periodic table?
4 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 116
Topic
The basis for modern periodic table is……… (b) The horizontal rows in a periodic table are called………. (c) Group 1 elements are called
4 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 263
Topic
Which group of elements could be placed in Mendeleev’s periodic table later on, without disturbing the original order? Give reason.
4 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 134
Page 19 / 109

How Can We Help?

    Home

    About Us

    Contact Us

    Privacy Policy

    Term of Use

    Copyright © 2020 Eanshub

    All Rights Reserved