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Deepak Rock
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Joined: Aug 6, 2021
Last seen: Sep 10, 2021
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Topics: 1742 / Replies: 303
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Topic
The position of three elements A, B and C in the periodic table are shown below:
3 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 437
Topic
An atom has electronic configurations 2, 8, 7. (a) What is the atomic number of this element? (b) To which of the following elements would it be chemically similar? (Atomic numbers are given in parentheses).
3 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 366
Topic
(a) Which property do all elements in the same column of the periodic table as boron have in common? (b) Which property do all elements in the same column of the periodic table as fluorine have in common?
3 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 161
Topic
Which element has: (a) two shells, both of, which are completely filled with electrons? (b) the electronic configuration 2, 8, 2?
3 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 91
Topic
Element X forms a chloride with the formula XCI, which is solid with high melting point. X is most likely to be in the same group of the periodic table as:
3 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 295
Topic
Which of the following statements is not a correct statement about the trends when going from left to right across the periods of periodic table?
3 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 329
Topic
By considering their position in the Periodic Table, which one of the following elements would you expect to have maximum metallic characteristics? Ga, Ge, As, Se, Be
3 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 98
Topic
In the Modern Periodic Table, which are the metals among the first ten elements?
3 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 245
Topic
Lithium, sodium, and potassium are all metals that react with water to liberate hydrogen gas. Is there any similarity in the atoms of these elements? (b) Helium is an unreactive gas and neon is a gas of extremely low reactivity.
3 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 120
Topic
Name: (i) three elements that have a single electron in their outermost shells. (ii) three elements that have two electrons in their outermost shells. (iii) three elements with filled outermost shells.
3 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 249
Topic
Name two elements you would expect to show chemical reactions similar to magnesium. What is the basis for your choice?
3 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 146
Topic
How could the Modern Periodic Table remove various anomalies of Mendeleev’s Periodic Table?
3 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 264
Topic
Why do you think the noble gases are placed in a separate group?
3 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 295
Topic
What were the criteria used by Mendeleev in creating his periodic table?
3 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 309
Topic
Besides gallium, which two other elements have since been discovered that fill the gaps left by Mendeleev in his periodic table?
3 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 364
Topic
Use Mendeleev’s periodic table to predict the formulae for the oxides of the elements: K, C, Al, Si, Ba.
3 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 137
Topic
What were the limitations of Newlands’ Law of Octaves?
3 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 89
Topic
What were the limitations of Doberiener’s Triads?
3 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 102
Topic
Did Doberiener’s triads also exist in the columns of Newlands’ Octaves? Compare and find out.
3 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 117
Topic
Explain the mechanism of cleansing action of soap.
3 years ago
Forum
Carbon and Its Compounds
Replies: 0
Views: 412
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