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Question
Lithium, sodium, and potassium elements were put in one group on the basis of their similar properties. What are those similar properties?
Solution
Elements of lithium, sodium, and potassium have the following similar properties:
- All these have one electron in the outermost shell.
- They form unipositive ions.
- They are good reducing agents.
- They are soft metals.
- They impart color to the flame.
- The common name of the group is alkali metals [Group 1A].
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RELATED QUESTIONS
Choose the correct answer from the choice given:
In the periodic table, alkali metals are placed in the group __________
What is the colour of the flame of sodium and potassium?
How the reaction can proceed continuously?
Match the Column A with Column B.
| Column A | Column B | ||
| (a) | Water | 1. | Lithium |
| (b) | Alkali metal | 2. | Iodine |
| (c) | Halogen | 3. | Covalent compound |
| (d) | Calcium oxide | 4. | Acetic acid |
| (e) | Weak acid | 5. | Ionic compound |
| 6. | Sulphuric acid | ||
Assertion (A): Alkali metals do not form dipositive ions.
Reason (R): After loss of one electron alkali metals achieve a stable electronic configuration of noble gases.
In the periodic table alkali metals are placed in the group ______.
This question refers to the elements of the Periodic Table with atomic numbers from 3 to 18. Some of the elements are shown by letters, but the letters are not the usual symbols of the elements.
| 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| A | B | C | D | E | F | G | H |
| 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 |
| I | J | K | L | M | N | O | P |
Which of these is an alkali metal?
