What is true of alkali metals?
The alkali metals consist of the chemical elements lithium (Li), sodium (Na), potassium (K), rubidium (Rb), caesium (Cs), and francium (Fr). The alkali metals are all shiny, soft, highly reactive metals at standard temperature and pressure and readily lose their outermost electron to form cations with charge +1.
Which of the following is an alkali metal?
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). These are (except for hydrogen) soft, shiny, low-melting, highly reactive metals, which tarnish when exposed to air.
What is alkali metal Class 10?
In the periodic table, the alkali metals are a group or column containing the chemical elements such as lithium (Li), sodium (Na), rubidium (Rb), potassium (K), francium (Fr) and Caesium (Cs). All the alkali metals react with water, with the heavier alkali metals reacting more overwhelmingly than the lighter ones.
What makes the alkali metals so reactive?
Alkali metals are among the most reactive metals. This is due in part to their larger atomic radii and low ionization energies. They tend to donate their electrons in reactions and have an oxidation state of +1. All these characteristics can be attributed to these elements’ large atomic radii and weak metallic bonding.
What are two most important alkaline earth metals?
All of the alkaline earth metals except magnesium and strontium have at least one naturally occurring radioisotope. Magnesium and calcium are ubiquitous and essential to all known living organisms.
Why are alkali metals not found in nature?
-Alkali metals include the elements lithium, sodium, potassium, rubidium, cesium, and francium. -They are never found in nature uncombined because they are unstable and they react fast to other elements easily by losing the electron. They bond well with all elements except the noble gases.
Why alkali metals are good reducing agents?
They can attain the noble gas electronic configuration by the removal of one electron which is a stable configuration. Due to low ionization potential and having the smallest nuclear charge they can easily lose an electron. Hence, alkali metals are considered as a powerful reducing agent.
What are the common physical and chemical features of alkali metal?
The alkali metals are a group of chemical elements from the s-block of the periodic table with similar properties: they appear silvery and can be cut with a plastic knife. Alkali metals are highly reactive at standard temperature and pressure and readily lose their outermost electron to form cations with charge +1.
Why are they called the alkaline earth metals?
The name comes from the fact that the oxides of these metals produced basic solutions when dissolved in water, and they remained solids at the temperatures available to the ancient alchemists. Like the Group 1A elements, the alkaline earth metals are too reactive to be found in nature in their elemental form.
How do we use alkaline earth metals?
Other uses include calcium chloride as a deicer and limestone as a white pigment in paints and toothpaste. Strontium is widely used in fireworks and magnets. Barium compounds can be used in paints, filler for rubber, plastic, and resins, and as a contrast medium for X-rays.