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प्रश्न
Write the name.
The atom having smallest atomic radius from group 1.
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उत्तर
The atom having smallest atomic radius from group 1- Hydrogen (H)
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संबंधित प्रश्न
Rewrite the following statement after correction, if necessary:
Periods are the horizontal rows of elements.
Rewrite the following statement after correction, if necessary:
Isotopes are the elements of the same group.
Why do we classify elements?
The element which can from an acidic oxide should be the one whose atomic number is:
(a) 6
(b) 16
(c) 12
(d) 19
As element X has mass number 40 and contains 21 neutrons in its atom. To which group of the periodic table does it belong?
An element A has an atomic number of 6. Another element B has 17 electrons in its one neutral atom.
(a) In which groups of the periodic table would you expect to find these elements?
(b) what type of bond is formed between A and B?
(c) Suggest a formula of the compound formed between A and B.
Rearrange the columns 2 and 3 so as to match with the column 1.
| Column 1 | Column 2 | Column 3 |
| i. Triad ii. Octave iii. Atomic number iv. Period v. Nucleus vi. Electron |
a. Lightest and negatively charged particle in all the atoms b. Concentrated mass and positive charge c. Average of the first and the third atomic mass d. Properties of the eighth element similar to the first e. Positive charge on the nucleus f. Sequential change in molecular formulae |
1.Mendeleev
2. Thomson
3. Newlands
4. Rutherford
5. Dobereiner
. Moseley
|
What was the basis of the earliest attempts made for classification and grouping of elements?
Elements belonging to the same group have the same valency.
Example for liquid metal is ______.
Which of the following have inert gases 2 electrons in the outermost shell.
Name the neutral atom in the Periodic Table which has the same number of electrons as K+ and Cl-.
Which of the following is a transition element?
An element with the atomic number 40 is placed in the period.
Which of the following metals have low melting and boiling point?
Relate the names of the following scientists with the statements given below.
Arranged elements into groups containing three elements each.
Complete the following triads by inserting the missing elements.
Li, ______, K
Complete the following triads by inserting the missing elements.
Ca, ______, Ba
The atomic number of an element 'X' is 11.
- Write the electronic configuration of X and find its valency.
- Write the formula and nature of its oxide.
