Which two groups of elements in the periodic table are the most reactive?(1 point)
Responses
noble gases and alkali metals
noble gases and alkali metals
alkaline earth metals and halogens
alkaline earth metals and halogens
alkali metals and halogens
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)
Responses
They are both classified as halogens.
They are both classified as halogens.
They have the same number of valence electrons.
They have the same number of valence electrons.
They have the same number of electron shells.
They have the same number of electron shells.
They are both inert.
They have the same number of valence electrons.
Which property do transition metals have in common?(1 point)
Responses
They are usually very reactive.
They are usually very reactive.
They usually have high melting points.
They usually have high melting points.
They usually have low densities.
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)
Responses
metallic texture
metallic texture
silver color
silver color
strong odor
strong odor
low or no reactivity
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)
Responses
1 - alkali metals
1 - alkali metals
18 - noble gases
18 - noble gases
17 - halogens
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 (Group 1) and the halogens (Group 17).
To determine this answer, you can refer to the periodic table. The alkali metals are located in Group 1 and include elements such as lithium, sodium, and potassium. These elements have only one valence electron in their outermost shell, which makes them highly reactive and eager to lose that electron in chemical reactions.
On the other hand, the halogens are located in Group 17 and include elements such as fluorine, chlorine, and bromine. These elements have seven valence electrons in their outermost shell, making them highly reactive and eager to gain one more electron to complete their outer shell.
When alkali metals react with halogens, they form ionic compounds and undergo dramatic chemical reactions. This is why alkali metals and halogens are considered the most reactive groups in the periodic table.