19. What is common name given to Group 1 elements? Why it ito?
Answers
.. all are metals... etc...
Answer:
Included in the Group 1 of the periodic table are the following elements:
Lithium
Sodium
Potassium
Rubidium
Caesium
The general electronic configuration of Group 1 elements is ns1. They have a strong tendency to donate their valence electron in the last shell to form strong ionic bonds. They have the least nuclear charge in their respective periods. As we move down the group, the atomic radius increases. Therefore, the nuclear charge decreases. Caesium is the most metallic element in the group.
In order to prevent the elements from coming in contact with oxygen, they are stored in jars that contain oil. The melting points of these elements are quite low, which is 180° Celsius in the case of Lithium, while it is 39° Celsius in the case of Rubidium. When it comes to the density of the metal, group one elements display a very low level of density of up to 1 gcm-3 which means that they can easily float on the surface of the water.
Therefore, if we decide to cut these metals, we will be able to do so, without much trouble. Upon being cut into two halves, we can observe that their surface is as shiny as any other metal but even after they are stored in oil, they undergo tarnishing. As a conductor of heat and electricity, they are excellent.
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