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Questions
How many rows and columns are there in the modern periodic table?
Write the number of periods and groups in the modern periodic table.
Answer the following sub-question regarding the modern periodic table:
Write the number of periods and groups.
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Solution
In the modern periodic table, there are 18 vertical columns known as groups and 7 horizontal rows known as periods.
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RELATED QUESTIONS
Fill in the following blank with suitable word:
The basis for modern periodic table is ...............
On which side of the periodic table will you find non-metals?
Which of the following statement is correct in regard to the classification of elements?
(a) Elements in modern periodic table are arranged on the basis of increasing atomic masses.
(b) Elements in Mendeleev's periodic table are arranged on the basis of increasing atomic numbers.
(c) In modern periodic table, the element nickel of lower atomic mass is kept before the element cobalt of higher atomic mass.
(d) In modern periodic table, the isotopes of chlorine having different atomic masses are kept in the same group.
Which element has the electronic configuration 2, 8, 2?
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State how the valency of elements varies in a group of the periodic table?
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(i) Which two elements belong to the same group?
(ii) Which two elements belong to the same period?
Give reasons for your choice.
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The tabular arrangement of elements in horizontal rows and vertical columns _________
Correct the statement.
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Give the chemical formula of ammonium sulphate
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Right or wrong sentence.
The modern periodic table shows the molecular masses of the elements in each frame.
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s-block - p-block
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The amount of energy released when one or more electrons is added to the neutral atom is ______
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Spot the error:
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| Group No. → | 1 | 2 | 13 | 14 | 15 | 16 | 17 | 18 |
| Period ↓ | ||||||||
| 2 | A | B | ||||||
| 3 | E | D | F | C |
Write the molecular formula of the compound formed by the combination:
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An element has 2 electrons in its N shell.
State its position in periodic table.
