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Question
An element A has 2 electrons in its fourth shell. State:
position in the periodic table
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Solution
Position in the periodic table is group 2 period 4
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RELATED QUESTIONS
Write the number of periods the Modern Periodic Table has. State the changes in valency and metallic character of elements as we move from left to right in a period. Also state the changes, if any, in the valency and atomic size of elements as we move down a group.
How does the valency of elements vary in going down a group of the periodic table?
Fill in the blank in the following statement:
On moving form right to left in the second period, the number of valency electrons ...............
Taking into consideration the period of the elements given below, answer the following questions:
| Elements | Atomic Radius (pm) |
| O | 66 |
| B | 88 |
| C | 77 |
| N | 74 |
| Be | 111 |
| Li | 152 |
- Arrange the above elements in decreasing order of their atomic radii.
- State the period to which the above elements belong.
- Why this arrangement of elements is similar to the above period of modern periodic table?
- Which of the above elements have the biggest and the smallest atom?
- What is the periodic trend observed in the variation of atomic radius while going from left to right within a period?
What is meant by a group in the periodic table?
The following questions refer to the Periodic Table.
What is the common feature of the electronic configurations of the elements in group 7?
Based on the group valency of element write the molecular formula of the following compound giving justification:
Oxide of first group elements.
Based on the group valency of element write the molecular formula of the following compound giving justification:
Compound formed when an element A of group 2 combines with an element B of group seventeen.
State the following:
The group which contains highly electropositive metals including sodium.
Which of the following would weigh the least?
(Atomic masses C = 12, 0 = 16, Na = 23)
