Q2.7CYL - Chemistry (OpenStax)

Question

Give the group name for each of the following elements: (a) krypton (b) selenium (c) barium (d) lithium

Step-by-Step Solution

Answer

1. noble gas; 
2.  chalcogen; 
3.  alkaline earth metal; 
4.  alkali metal

Step1: Definition of noble gas:

Any of a class of rare gases that display high stability and extremely low reaction rates, such as helium, neon, argon, krypton, xenon, and generally radon.

Step 2: Definition of chacogens:

Because most copper ores (Greek chalkos) are oxides or sulphides, and such ores contain quantities of selenium and tellurium, the group VIA elements are referred to as chalcogens.

Step 3: Definition of alkaline earth metal:

The alkaline earth metals are named after its oxides, the alkaline earths, which used to be known as beryllia, magnesia, lime, strontia, and baryta. When mixed with water, these oxides become basic (alkaline).

Step 4: definition of alkali metals:

Heat, hydrogen gas, and the equivalent metal hydroxide are produced when alkali metals react with water. The heat generated by this reaction has the potential to ignite the hydrogen or the metal itself, resulting in a fire or explosion.