Which two groups of elements in the periodic table are the most reactive?(1 point)
1. alkali metals and halogens.
2. They have the same number of valence electrons.
3. They usually have high melting points.
4. Low or no reactivity.
5. 17.
im a pc i right 100%
Alkali metals and alkaline earth metals (groups I and II)
To determine the two most reactive groups of elements in the periodic table, you need to understand how reactivity is related to atomic structure. Reactivity is generally determined by an element's tendency to gain or lose electrons in chemical reactions.
Group 1 elements, also known as the alkali metals, and Group 17 elements, also known as the halogens, are the two most reactive groups in the periodic table.
1. Alkali Metals (Group 1): These elements include lithium (Li), sodium (Na), potassium (K), and others. Alkali metals have a single electron in their outermost energy level, which they readily lose to achieve a stable electron configuration. They react violently with water and oxygen in the air.
2. Halogens (Group 17): This group contains elements like fluorine (F), chlorine (Cl), bromine (Br), and iodine (I). Halogens have seven electrons in their outermost energy level, and they readily gain one electron to achieve a stable electron configuration. They are highly reactive and are often found combined with other elements in compounds.
In conclusion, the alkali metals (Group 1) and halogens (Group 17) in the periodic table are the most reactive groups of elements.