Respuesta :
Answer:
Lithium
Explanation:
Alkali metals are group of metals which are present in first group of periodic table. As we know atomic number is equal to number of protons contained by a particular element. Therefore, the alkali metals along with there number of protons are listed below;
Alkali Metal Number of Protons
Lithium 3
Sodium 11
Potassium 19
Rubidium 37
Cesium 55
Francium 87
Hence, it is cleared from above table that Lithium is having fewer protons than 10.
Alkali metals are known as the elements that constitute the s-block of the periodic table. Some of the elements of alkali metals are lithium, sodium, caesium, and potassium. The alkali metal with fewer than 10 protons in the nucleus is Lithium.
The alkali metals are the elements in which the valence electrons are filled in the s-orbital of the element. The metals occupy the first group of the periodic table. The protons are the sub-atomic particles, which have positive charge and are embedded in the nucleus. The electrons are the negatively charged sub-atomic particles, which revolve around the nucleus. The element with the fewer than 10 protons in the nucleus is lithium.
Some of the number of protons in the alkali metals are listed below:
Alkali Metal Protons
- Lithium 3
- Sodium 11
- Potassium 19
- Rubidium 37
- Cesium 55
Therefore, the alkali metal lithium has 3 protons in its nucleus.
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