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romiroy12
romiroy12
@romiroy12
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Joined: Oct 18, 2020
Last seen: Jul 3, 2023
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Topics: 2049 / Replies: 0
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Topic
An element ‘M’ has atomic number 11. (a) Write its electronic configuration. (b) State the group to which ‘M’ belongs. (c) Is ‘M’ a metal or a non-metal? (d) Write the formula of its chloride.
5 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 150
Topic
State the Modern Periodic Law for classification of elements. How many (a) groups and (b) periods are there in the Modern Periodic Table?
5 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 132
Topic
An element ‘X’ has atomic number 13. (a) Write its electronic configuration. (b) State the group to which ‘X’ belongs. (c) Is ‘X’ a metal or a non-metal? (d) Write the formula of its bromide.
5 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 635
Topic
The positions of three elements A, B and C in the periodic table are indicated below: Group 16 - Group 17 — - (First Period) — - A (Second Period)
5 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 130
Topic
The atomic number of an element is 16. Predict 1. the number of valence electrons in its atom 2. its valency its group number 3. whether it is a metal or a non-metal 4. the nature of oxide formed by it 5. the formula of its chloride
5 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 179
Topic
Two elements X and Y belong to groups 1 and 2 respectively in the same period of periodic table. Compare them with respect to: periodic table from the left to the right and why?
5 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 116
Topic
Give reasons: 1. Elements in a group have similar chemical properties. 2. Elements of Group I form ions with a charge of +1.
5 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 151
Topic
In the periodic table, how does the tendency of atoms to lose electrons change on going from 1. left to right across a period? 2. top to bottom in a group?
5 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 195
Topic
How does the valency of elements vary (a) in going down a group, and (b) in going from left to right in a period of the periodic table?
5 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 113
Topic
How does the metallic character of elements change along a period of the periodic table from the left to the right and why?
5 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 98
Topic
In the modern periodic table, the element Calcium (atomic number = 20) is surrounded by elements with atomic numbers 12, 19, 21 and 38. Which of these elements has physical and chemical properties resembling those of Calcium and why?
5 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 118
Topic
On the basis of electronic configuration, how will you identify the first and the last element of a period?
5 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 212
Topic
The atomic numbers of three elements, X, Y and Z are 9, 11 and 17 respectively. Which two of these elements will show similar chemical properties? Why?
5 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 449
Topic
How does the electronic configuration of an atom of an element relate to its position in the modern periodic table? Explain with one example.
5 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 161
Topic
How can the valency of an element be determined if its electronic configuration is known? What will be the valency of an element of atomic number 9 (nine)?
5 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 136
Topic
Atoms of eight elements A, B, C, D, E, F, G and H have the same number of electronic shells but different number of electrons in their outermost shells. It was found that elements A and G combine to form an ionic compound which can also be extracted ...
5 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 178
Topic
Atoms of eight elements A, B, C, D, E, F, G and H have the same number of electronic shells but different number of electrons in their outermost shell. It was found that elements A and G combine to form an ionic compound.
5 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 107
Topic
In the following table, are given eight elements A, B, C, D, E, F, G and H (here letters are not the usual symbols of the elements) of the Modern Periodic Table with the atomic numbers of the elements in parenthesis.
5 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 976
Topic
In the following table, six elements A, B, C, D, E and F (here letters are not the usual symbols of the elements) of the Modern Periodic Table with atomic numbers 3 to 18 are given:
5 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 1483
Topic
Atoms of seven elements A, B, C, D, E, F and G have a different number of electronic shells but have the same number of electrons in their outermost shells. The elements A and C combine with chlorine to form an acid and common salt respectively.
5 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 508
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