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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
Three elements A, B and C have 3, 4 and 2 electrons respectively in their outermost shell. Give the group number to which they belong in the Modern Periodic Table. Also, give their valencies.
5 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 138
Topic
Write the formula of chlorides of Eka-silicon and Eka-aluminium, the elements predicted by Mendeleev.
5 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 148
Topic
“Hydrogen occupies a unique position in the Modern Periodic Table”. Justify the statement.
5 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 177
Topic
How many periods are there in the Modern Periodic Table of elements? (b) How do atomic radius, valency and metallic character vary down a group? (c) How do the atomic size and metallic character of elements vary as we move from left to right in a p...
5 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 268
Topic
How are the following related? (i) Number of valence electrons of different elements in the same group. (ii) Number of shells of elements in the same period.
5 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 391
Topic
Na, Mg and Al are the elements having one, two and three valence electrons respectively. Which of these elements (a) has the largest atomic radius, (b) is least reactive? Justify your answer stating reason for each.
5 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 117
Topic
F, Cl and Br are the elements each having seven valence electrons. Which of these (a) has the largest atomic radius, (b) is most reactive? Justify your answer stating reason for each.
5 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 242
Topic
The atomic numbers of three elements are given below: Element (symbol) - A - B - C Atomic number - 3 - 6 - 9 Write the symbol of the element which belongs to (a) group 1, (b) group 14, of the periodic table. State the period of the periodic table ...
5 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 1185
Topic
Write the atomic number of these elements. What will be formula of the compound formed and the nature of bond between them when these two elements chemically combine together?
5 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 388
Topic
The atomic number of three elements are given below: Element (symbol) - A - B - C Atomic number - 5 - 7 - 10 Write the symbol of the element which belongs to (o) group 13, (b) group 15, of the periodic table. State the period of the periodic table...
5 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 327
Topic
The electronic configuration of two elements ‘A’ and ‘B’ are 2, 8, 3 and 2, 8, 7 respectively. Find the atomic number of these elements. State the nature and formula of the compound formed by the union of these two elements.
5 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 3025
Topic
An element has atomic number 13. (a) What is the group and period number to which this element belongs? (b) Is this element a metal or a non-metal? Justify your answer.
5 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 1040
Topic
Choose from the following: 4Be, 9F, 19K, 20Ca (a) The element having one electron in the outermost shell. (b) Two elements of the same group.
5 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 164
Topic
An element ‘E’ has following electronic configuration: K - L - M 2 - 8 - 6 (a) To which group of the periodic table does element ‘E’ belong? (b) To which period of the periodic table does element ‘E’ belong?
5 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 180
Topic
Why do all the elements of the (a) same group have similar properties, (b) same period have different properties?
5 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 142
Topic
Choose from the following: 20Ca, 3Li, 11Na, 10Ne (a) An element having two shells completely filled with electrons. (b) Two elements belonging to the same group of the periodic table.
5 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 757
Topic
The formula of magnesium oxide is MgO. State the formula of barium nitrate and barium sulphate, if barium belongs to the same group as magnesium.
5 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 258
Topic
An element ‘X’ belongs to 3rd period and group 17 of the periodic table. State its (a) electronic configuration, (b) valency. Justify your answer with reasoning.
5 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 270
Topic
Choose from the following: 6C, 8O, 10Ne, 11Na, 14Si (a) Elements that should be in the same period. (b) Elements that should be in the same group. State reason for your selection in each case.
5 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 399
Topic
The formula of its oxide An element ‘M’ has atomic number 12. (a) Write its electronic configuration. (b) State the group to which ‘M’ belongs. (c) Is ‘M’ a metal or a non-metal? (d) Write.
5 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 160
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