Which two groups of elements in the periodic table are the most reactive?(1 point)
Responses
alkali metals and halogens
alkali metals and halogens
noble gases and alkali metals
noble gases and alkali metals
alkaline earth metals and halogens
alkaline earth 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 are both inert.
They are both inert.
They have the same number of electron shells.
They have the same number of electron shells.
Skip to navigation
They have the same number of valence electrons.
Which property do transition metals have in common?(1 point)
Responses
They are usually very soft.
They are usually very soft.
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 reactive.
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
strong odor
strong odor
silver color
silver color
metallic texture
metallic texture
low or no reactivity
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
17 - halogens
17 - halogens
18 - noble gases
18 - noble gases
1 - alkali metals
1 - alkali metals
2 - alkaline earth metals
17 - halogens
The two groups of elements in the periodic table that are the most reactive are alkali metals and halogens.
To find this answer, you can refer to the periodic table. The alkali metals are located in Group 1 while the halogens are located in Group 17.
Alkali metals are very reactive because they have only one electron in their outermost shell, which they readily lose to form a positive ion. This makes them highly reactive with other elements.
Halogens, on the other hand, have seven electrons in their outermost shell and are in need of one more electron to achieve stability. Therefore, they are highly reactive and tend to gain electrons from other elements to achieve a stable configuration.
So, the combination of alkali metals and halogens leads to particularly strong reactions due to the opposite nature of their electron configurations.