Which two groups of elements in the periodic table are the most reactive?(1 point)
alkaline earth metals and halogens
halogens and noble gases
noble gases and alkali metals
alkali metals and halogens
alkali metals and halogens
Which two groups of elements in the periodic table are the most reactive?(1 point)
alkaline earth metals and halogens
halogens and noble gases
noble gases and alkali metals
alkali metals and halogens
The correct answer is: alkali metals and halogens
Which property do transition metals have in common?(1 point)
They usually have high melting points.
They are usually very reactive.
They are usually very soft.
They usually have low densities.
The correct answer is: 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)
silver color
strong odor
low or no reactivity
metallic texture
The correct answer is: 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)
1 - alkali metals
18 - noble gases
2 - alkaline earth metals
17 - halogens
The correct answer is: 17 - halogens
The correct answer is alkali metals and halogens.
To determine which two groups of elements in the periodic table are the most reactive, you can look at the periodic table itself.
Alkali metals are found in Group 1 of the periodic table, which includes elements such as lithium, sodium, and potassium. These elements are highly reactive because they have only one valence electron, which they are eager to give away to achieve a stable electron configuration. As a result, alkali metals readily react with other elements, especially halogens.
Halogens are found in Group 17 of the periodic table, which includes elements such as fluorine, chlorine, and bromine. Halogens are very reactive because they have seven valence electrons and require one more electron to achieve a stable electron configuration. As a result, halogens readily react with alkali metals and other elements to gain this missing electron.
Therefore, the most reactive elements in the periodic table are alkali metals and halogens.