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
alkali metals and halogens
alkali metals and halogens
alkaline earth metals and halogens
alkaline earth metals and halogens
halogens and noble gases
alkali metals and halogens
Which statement about nitrogen (N) and phosphorus (P) is correct?
(1 point)
Responses
They are both inert.
They are both inert.
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 classified as halogens.
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 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 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
low or no reactivity
low or no reactivity
silver color
silver color
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)
Responses
1 - alkali metals
1 - alkali metals
2 - alkaline earth metals
2 - alkaline earth metals
18 - noble gases
18 - noble gases
17 - halogens
17 - halogens
The two groups of elements in the periodic table that are the most reactive are alkali metals and halogens. To determine this, you can look at the periodic table and consider the trends in reactivity.
Alkali metals are located in Group 1 of the periodic table, which includes elements such as lithium (Li), sodium (Na), and potassium (K). These elements are highly reactive because they have only one electron in their outermost energy level, making it easier for them to lose that electron and form positive ions. The reactivity of alkali metals increases as you go down the group because the outermost electron is further from the positively charged nucleus, resulting in weaker attraction and easier electron loss.
Halogens, on the other hand, are located in Group 17 of the periodic table, which includes elements such as fluorine (F), chlorine (Cl), and bromine (Br). These elements are highly reactive because they have seven electrons in their outermost energy level and only need to gain one more electron to achieve a stable electron configuration. The reactivity of halogens increases as you go up the group because the outermost electron is closer to the positively charged nucleus, resulting in stronger attraction and easier electron gain.
Therefore, the combination of alkali metals and halogens leads to high reactivity due to the ability of alkali metals to lose electrons easily and the tendency of halogens to gain electrons readily to achieve stability.