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