Which of the following is most chemically like Selenium (Se)?(1 point)
Responses
Sodium (Na)
Sodium (Na)
Bromine (Br)
Bromine (Br)
Oxygen (O)
Oxygen (O)
Arsenic (As)
Arsenic (As)
explain youre answer.
Arsenic (As) is the most chemically like Selenium (Se) because they belong to the same group on the periodic table (Group 16 or Group 6A). Elements within the same group have similar chemical properties and tend to form compounds with similar characteristics. Both Selenium and Arsenic have similar electronic configurations and can exhibit similar oxidation states and chemical reactivity. Additionally, Selenium and Arsenic are both metalloids, which are elements that have properties of both metals and non-metals.
Why not Bromine?
Bromine (Br) is also in the same group as Selenium (Group 17 or Group 7A), so it does share some chemical similarities with Selenium. However, Arsenic (As) is more chemically like Selenium (Se) because they both belong to the same group (Group 16 or Group 6A) and have more similar properties and reactivity. While Bromine and Selenium both have similar electronegativity values and can form covalent compounds, Arsenic shares more chemical characteristics with Selenium, such as similar oxidation states and chemical behavior. Therefore, Arsenic is considered to be more chemically like Selenium compared to Bromine.
Which group on the periodic table is the most likely placement for an unidentified metal that exhibits the following characteristics: low melting point, floats in water, and reacts vigorously with water?(1 point)
Responses
Group 1
Group 1
Group 2
Group 2
Group 11
Group 11
Group 12
Group 1
explain
Group 1 elements, also known as alkali metals, are the most likely placement for an unidentified metal that exhibits the given characteristics.
Alkali metals have low melting points, which aligns with the characteristic of the unidentified metal having a low melting point. These metals also have low densities, allowing them to float on water. Additionally, alkali metals are highly reactive with water, reacting vigorously to produce hydrogen gas and an alkaline solution.
Elements in Group 2, also known as alkaline earth metals, have higher melting points and do not react as vigorously with water compared to alkali metals. Group 11 elements, also known as transition metals, do not exhibit the characteristic of reacting vigorously with water. Group 12 elements, also known as post-transition metals, typically have higher melting points and are not as reactive with water as alkali metals.
What element exhibits the most similar reactivity to chlorine, and what are the reasons for this similarity?
(1 point)
Responses
fluorine because at room temperature they are both gases
fluorine because at room temperature they are both gases
oxygen because they both gain two electrons to form anions
oxygen because they both gain two electrons to form anions
Phosphorus because they are both located in the same period
Phosphorus because they are both located in the same period
fluorine because they both have seven valence electrons
fluorine because they both have seven valence electrons
explain.
Fluorine (F) exhibits the most similar reactivity to chlorine (Cl) because they both have seven valence electrons. Valence electrons are the outermost electrons in an atom and are responsible for the element's chemical behavior. Both fluorine and chlorine are in Group 17, also known as the halogens, which means they have seven valence electrons.
Having seven valence electrons makes both fluorine and chlorine highly reactive. These elements are one electron away from achieving a stable electron configuration, which is typically achieved by gaining or sharing one electron. So, both fluorine and chlorine tend to undergo reactions to gain that missing electron and achieve a stable electron configuration, forming negatively charged ions (anions).
In terms of their reactivity, fluorine and chlorine are both strong oxidizing agents, meaning they readily accept electrons from other elements in chemical reactions. They also have similar electronegativities, meaning they have a strong attraction for electrons. This contributes to their ability to form strong covalent bonds with other elements.
Therefore, due to their similar valence electron configuration and resulting reactivity, fluorine is the element that exhibits the most similar reactivity to chlorine.
Which statement is accurate concerning the alkali metals?(1 point)
Responses
They are located in group 17 of the periodic table.
They are located in group 17 of the periodic table.
They are at the very bottom of the periodic table.
They are at the very bottom of the periodic table.
They are located in the center of the periodic table.
They are located in the center of the periodic table.
They are located in group 1 of the periodic table
They are located in group 1 of the periodic table
What description most accurately characterizes argon?
(1 point)
Responses
Argon, being a noble gas, displays remarkable unreactivity due to its complete valence shell.
Argon, being a noble gas, displays remarkable unreactivity due to its complete valence shell.
Argon is a halogen and exhibits high unreactivity owing to its partially filled valence shell.
Argon is a halogen and exhibits high unreactivity owing to its partially filled valence shell.
Argon is a halogen and displays remarkable reactivity as it possesses a partially filled valence shell.
Argon is a halogen and displays remarkable reactivity as it possesses a partially filled valence shell.
Argon, classified as a noble gas, demonstrates significant reactivity due to its complete valence shell.