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प्रश्न
Choose the correct option and rewrite the statement.
The number of electrons in the outermost shell of alkali metals is _______.
पर्याय
1
2
3
7
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उत्तर
The number of electrons in the outermost shell of alkali metals is 1.
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संबंधित प्रश्न
Rewrite the following statement after correction, if necessary:
Groups have elements with consecutive atomic numbers.
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.
An element X from group 2 reacts with element Y from group 16 of the periodic table.
(a) What is the formula of the compound formed?
(b) What is the nature of bond in the compound formed?
A metal X is in the first group of the periodic table. What will be the formula of its oxide?
An element X (atomic number 17) reacts with an element Y (atomic number 20) to form a compound.
(a) Write the position of these elements in the modern periodic table.
(b) Write the formula of the compound formed.
Justify your answer in each case.
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
|
How did the early chemists classify elements?
Which of the following have inert gases 2 electrons in the outermost shell.
Moseley’s periodic table is based on atomic mass.
What property forms the basis of identification?
Name the neutral atom in the Periodic Table which has the same number of electrons as K+ and Cl-.
An element X combines with oxygen to form an oxide XO. This oxide is electrically conducting. Write the formula of the compound formed when X reacts with chlorine.
Which of the following hydroxides is most basic?
Which of the following property will be common in group 1 elements?
The element with atomic number 26 will be found in group ______
Identify and name the metals out of the following elements whose electronic configurations are given below.
- 2, 8, 2
- 2, 8, 1
- 2, 8, 7
- 2, 1
Complete the following triads by inserting the missing elements.
Li, ______, K
Complete the following triads by inserting the missing elements.
Ca, ______, Ba
