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NEET Exam > Chemistry Class 12 > Flashcard: s-block Elements
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100 videos|282 docs|123 tests
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FAQs on Flashcard: s-block Elements Video Lecture - Chemistry Class 12 - NEET
| 1. What are s-block elements? |  |
Ans. s-block elements are a group of elements in the periodic table that belong to Group 1 (alkali metals) and Group 2 (alkaline earth metals). These elements have their outermost electron in the s orbital and are characterized by their low ionization energies and high reactivity.
| 2. Which elements are included in the s-block? | |
Ans. The s-block elements include the alkali metals (Group 1) which are hydrogen (H), lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr). The alkaline earth metals (Group 2) include beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra).
| 3. What are the common properties of s-block elements? | |
Ans. s-block elements share certain common properties such as low ionization energies, high reactivity, and the tendency to form positive ions. They are typically soft metals with low melting and boiling points. Alkali metals are known for their ability to react vigorously with water, while alkaline earth metals are less reactive but still form compounds readily.
| 4. Why are s-block elements highly reactive? | |
Ans. s-block elements are highly reactive due to their low ionization energies. The outermost electron in these elements is in the s orbital, which is relatively far from the nucleus and experiences less shielding from inner electrons. This makes it easier for the outermost electron to be removed, leading to the formation of positive ions and the release of energy.
| 5. What are some practical applications of s-block elements? | |
Ans. s-block elements have various practical applications. For example, lithium is used in rechargeable batteries, sodium is used in the production of chemicals and as a coolant in nuclear reactors, and magnesium is used in the production of lightweight alloys. Calcium is essential for strong bones and teeth, while barium is used in medical imaging.
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