Which two groups of elements in the periodic table are the most reactive?(1 point)
alkaline earth metals and halogens
noble gases and alkali metals
alkali metals and halogens
halogens and noble gases
alkali metals and halogens
Use the periodic table to answer the question.
An illustration shows the periodic table.
Which statement about nitrogen (N) and phosphorus (P) is correct?
(1 point)
They are both inert.
They are both classified as halogens.
They have the same number of valence electrons.
They have the same number of electron shells.
They have the same number of electron shells.
Which property do transition metals have in common?(1 point)
They are usually very reactive.
They usually have high melting points.
They usually have low densities.
They are usually very soft.
They usually have high melting points.
Neon and argon are both in Group 18 of the periodic table. Which property do they most likely share?(1 point)
strong odor
silver color
low or no reactivity
metallic texture
low or no reactivity
A scientist studies an element that has seven electrons in its outer shell, is fairly toxic, is a gas at room temperature, and is highly reactive. To which group of the periodic table does this element belong?(1 point)
18 - noble gases
1 - alkali metals
17 - halogens
2 - alkaline earth metals
17 - halogens
The two groups of elements in the periodic table that are the most reactive are the alkali metals and the halogens. To find the answer, you need to understand the periodic table and the trends in reactivity.
First, let's look at the alkali metals. These elements are located in Group 1 of the periodic table, which includes elements such as lithium, sodium, and potassium. Alkali metals are highly reactive because they have only one electron in their outermost energy level. This makes them very eager to lose that electron and achieve a stable electron configuration.
Next, let's examine the halogens. Halogens are located in Group 17 of the periodic table, and they include elements such as fluorine, chlorine, and iodine. Halogens are also highly reactive because they have seven electrons in their outermost energy level, leaving them one electron short of achieving a stable electron configuration. As a result, halogens are very eager to gain one electron and achieve stability.
When alkali metals and halogens come into contact, they react readily with each other. Alkali metals readily lose their outermost electron, while halogens readily gain that electron. This reaction results in the transfer of electrons and the formation of ionic compounds.
In conclusion, the two groups of elements in the periodic table that are the most reactive are the alkali metals and the halogens because of their electron configurations and their tendency to gain or lose electrons to achieve stability.