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प्रश्न
Moseley’s periodic table is based on atomic mass.
विकल्प
True
False
उत्तर
False
Correct Statement: Moseley’s periodic table is based on atomic number.
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संबंधित प्रश्न
State whether the following statement is true of false:
The elements in a group have consecutive atomic numbers.
A metal X is in the first group of the periodic table. What will be the formula of its oxide?
The non-metal A is an important constituent of our food and most of the fuels around us. A forms two oxides B and C. The oxide B is poisonous whereas oxide C causes global warming.
(a) Identify A, B and C.
(b) To which group of periodic table does A belong?
(c) Name another element which is placed in the same group as A.
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
|
Elements belonging to the same group have the same valency.
The atom of an element has electronic configuration 2, 8, 7. To which of the following elements would it be chemically similar?
In which group are inert elements placed?
Which type of elements are poor conductors of heat and electricity?
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 in the increasing order of atomic mass.
