What quality differentiates hydrogen (H) from the other elements in group 1, the alkali metals?(1 point)
Responses
It has more than one valence electron.
It is not very reactive.
It is a non-metal.
It is found by itself in nature.
The quality that differentiates hydrogen (H) from the other elements in group 1, the alkali metals, is that it is a non-metal.
Hydrogen is unique in the periodic table for its properties, which are not typical of the other group 1 elements that are all metals (such as lithium, sodium, potassium, etc.) and are much more reactive in their metallic state. While hydrogen does share the characteristic of having one valence electron like the alkali metals, its non-metallic nature sets it apart from them in both chemical and physical properties.
what is the correct answer
The correct answer is:
It is a non-metal.
This is what differentiates hydrogen (H) from the other elements in Group 1, the alkali metals, which are all metals.
On which atomic property proposed by Henry Moseley is the current periodic table of the elements based?(1 point)
Responses
electric charge
atomic weight
atomic number
nucleus size
The current periodic table of the elements is based on the atomic property proposed by Henry Moseley, which is:
atomic number
Moseley's work demonstrated that the atomic number, which is the number of protons in an atom's nucleus, provided a more accurate organization of the elements than atomic weight, which had been used previously.
To determine the quality that differentiates hydrogen (H) from the other elements in Group 1, the alkali metals, we can look at the provided options:
1. "It has more than one valence electron."
This option is incorrect because hydrogen has only one valence electron, just like the other elements in Group 1.
2. "It is not very reactive."
This option is also incorrect because hydrogen is highly reactive, especially under certain conditions.
3. "It is a non-metal."
This option is partially correct. Hydrogen is indeed a non-metal, but so are elements like lithium, sodium, and potassium.
4. "It is found by itself in nature."
This option is the correct answer. Unlike the other elements in Group 1, hydrogen is found by itself in nature as a diatomic molecule (H2). In contrast, the alkali metals are always found in compounds with other elements.
Therefore, the quality that differentiates hydrogen (H) from the other elements in Group 1, the alkali metals, is that it is found by itself in nature.