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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
Mendeleev arranged all the 63 known elements in increasing order of their atomic masses. (True/False)
5 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 162
Topic
Diagonal elements from boron to polonium are known as _________.
5 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 272
Topic
Dobereiner’s system of classification was failed to arrange all the elements in the form of _________ having similar chemical properties.
5 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 141
Topic
Group ________ locate the element with electronic configuration 2, 7 in the modem periodic table.
5 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 112
Topic
When an element from the left side of the periodic table combines with an elements from the right side of the periodic table, _________bond is formed.
5 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 251
Topic
Those elements which have the same valence shell, belongs to the same __________ of the periodic table.
5 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 154
Topic
On going down in a group of the periodic table, the size of atoms _________.
5 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 107
Topic
Assertion: There are 118 elements discovered so far. Reason: Sulphur (16) belongs to Group 16 and belongs to 3rd period.
5 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 1189
Topic
Assertion: Fluorine is more reactive than chlorine. Reason: Fluorine and chlorine belong to Group 17 called Halogen.
5 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 1289
Topic
Assertion: K is more reactive than Na. Reason: K is smaller in size than Na.
5 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 960
Topic
Assertion: B(5) belongs to group 13 and silicon belongs to group 14. Reason: B2O3 is acidic oxide where SiO2 is amphoteric oxide.
5 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 651
Topic
Assertion: Group 1 and 2 elements all are metals. Reason: Group 1 and 2 elements can lose electrons early to form cations (positive ions).
5 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 1735
Topic
Which of the following is non-metal and to which group does it belong?
5 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 194
Topic
Silicon(14) belongs to class of (a) Metal (b) Non-metal (c) Metalloids (d) Ionic compound
5 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 305
Topic
Chlorine (17) belongs to which group and period (a) 7, 3 (b) 17, 3 (c) 1, 3 (d) 16, 3
5 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 296
Topic
Which of the following is most reactive? (a) F2 (b) Cl2 (c) Br2 (d) I2
5 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 119
Topic
Which of the following is most reactive?
5 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 126
Topic
Which of the following set of elements is written in order of their increasing metallic character?
5 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 112
Topic
Which one of the following does not increase while moving down the group of the periodic table?
5 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 108
Topic
The element with atomic number 14 is hard and forms acidic oxide and a covalent halide. To which of the following categories does the element belong?
5 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 96
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