GK
CHEMISTRY
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
calcium
|
|
|
magnesium
|
|
|
mercury
|
|
|
sodium
|
Detailed explanation-1: -Group 1A (or IA) of the periodic table are the alkali metals: hydrogen (H), lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr).
Detailed explanation-2: -The valence electron of Lithium, Sodium, and Potassium is same, i.e. . Hence, they belong to the same group. All of these elements undergo a chemical reaction with water and results in the formation of an alkali. Therefore, they are known as alkali metals.
Detailed explanation-3: -Group 2A (or IIA) of the periodic table are the alkaline earth metals: beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra).
Detailed explanation-4: -The alkali metals consist of the chemical elements lithium (Li), sodium (Na), potassium (K), rubidium (Rb), caesium (Cs), and francium (Fr).
Detailed explanation-5: -Alkali metals tend to lose one electron and form ions with a single positive charge. They form ionic compounds (salts) in reaction with the halogens (alkali halides). Sodium and potassium ions form important constituents of body fluids (electrolytes).