SCIENCE
CHEMISTRY
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
has a high melting point
|
|
|
easily combines chemically with other elements
|
|
|
burns in the presence of water
|
|
|
displaces dissolved oxygen
|
Detailed explanation-1: -Answer: Cesium is the most reactive element since it is the second from the bottom of this group, has six electron shells, and exhibits the characteristics of a reactive atom.
Detailed explanation-2: -The substances that go into a chemical reaction are called the reactants, and the substances produced at the end of the reaction are known as the products.
Detailed explanation-3: -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.
Detailed explanation-4: -The two most reactive groups of elements are the alkali metals and the halogens, because of their valence electrons.