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Honestly,
I don't know if this will help you but this is what I found on
http://en.wikipedia.org/wiki/Atomic_radius
"Atomic radii vary in a predictable and explicable manner across the Periodic Table. For instance, the radii generally decrease along each period (row) of the table, from the alkali metals to the noble gases; and increase down each group (column). The radius increases sharply between the noble gas at the end of each period and the alkali metal at the beginning of the next period. These trends of the atomic radii (and of various other chemical and physical properties of the elements) can be explained by the electron shell theory of the atom; they provided important evidence for the development and confirmation of quantum theory."
Lithium = 3
Sodium = 11
Potassium = 19
Rubidium = 37
Cesium = 55
Francium = 73
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Why do alkali metals have a low density?
Alkali metals have a low density because they have a single valence electron that is loosely held, leading to larger atomic size and lower atomic mass. This results in a less compact arrangement of atoms, contributing to the low density observed in alkali metals.
What do forces have to do with atomic radius of alkali metals?
Forces have an indirect impact on the atomic radius of alkali metals. As you move down a group of alkali metals in the periodic table, the atomic radius typically increases due to increased electron shells. The forces between the electrons and nucleus (electrostatic forces) contribute to the overall size of the atom in terms of atomic radius.
Why do alkali's get softer down the group 1?
Alkali metals get softer down Group 1 due to an increase in atomic size and weaker metallic bonding. As you move down the group, the atomic radius increases, leading to a decrease in the strength of metallic bonding and making the metals softer.
What are denser harder have higher melting points and are slightly less active than alkali metals in the same period?
These are characteristics of alkaline earth metals, such as calcium and magnesium. They have tightly packed metallic lattices, making them denser and harder than alkali metals. Their higher melting points and lower reactivity compared to alkali metals can be attributed to their lower atomic size and increased nuclear charge.
Are alkali metals low density soldids at room temperature?
Yes, alkali metals are typically low-density solids at room temperature. They have low melting and boiling points, resulting in them being found in solid form at standard conditions. Additionally, alkali metals have a low density due to their large atomic size and the presence of only one valence electron.
Why do alkali metals have a low density?
Alkali metals have a low density because they have a single valence electron that is loosely held, leading to larger atomic size and lower atomic mass. This results in a less compact arrangement of atoms, contributing to the low density observed in alkali metals.
What group of elements have members of the smallest atomic radii for a given period?
The group of elements with members of the smallest atomic radii for a given period is the group of noble gases. Noble gases have the smallest atomic radii because they have a completely filled valence shell, which results in strong electron-electron repulsions and a smaller atomic size.
What are the two variables that affect atomic size?
Alkali metals and noble gases
What do forces have to do with atomic radius of alkali metals?
Forces have an indirect impact on the atomic radius of alkali metals. As you move down a group of alkali metals in the periodic table, the atomic radius typically increases due to increased electron shells. The forces between the electrons and nucleus (electrostatic forces) contribute to the overall size of the atom in terms of atomic radius.
What is the biggest element in the alkali family?
The biggest element in the alkali family is cesium. It has the largest atomic radius and is the most reactive alkali metal due to its large size and low ionization energy.
Define atomic radii?
The atomic radii is the measure of the size of the atoms in a chemical element. This is the distance from the nucleus to the boundary of the electrons' cloud.
How does the density of the alkaline earth metal compare with alkali metal?
The density of alkaline earth metals is generally higher than that of alkali metals. This is because alkali metals have only one valence electron and are larger in size compared to alkaline earth metals, which have two valence electrons and are smaller in size. The higher density of alkaline earth metals is due to their more compact atomic structure.
Why do alkali's get softer down the group 1?
Alkali metals get softer down Group 1 due to an increase in atomic size and weaker metallic bonding. As you move down the group, the atomic radius increases, leading to a decrease in the strength of metallic bonding and making the metals softer.
Are ions of alkali metals larger or smallest than ions of alkaline earth metals from the same period?
Ions of alkali metals are generally larger than ions of alkaline earth metals from the same period because alkali metals have only one outer electron, leading to a larger atomic radius and therefore a larger ion size compared to alkaline earth metals, which have two outer electrons.
What is the difference between atomic radii and ionic radii?
Atomic radii refer to the size of an atom, measured as the distance from the center of the nucleus to the outer electron shell. Ionic radii, on the other hand, refer to the size of an ion, which can be larger (anions) or smaller (cations) than the corresponding atom due to the gain or loss of electrons.
What trend do you note for the atomic radii of period 3?
The size of atom decreasing.
Why melting and boiling point of alkali metals are lower as compared to alkaline earth metals?
Alkali metals have weaker metallic bonding due to their larger atomic size and lower charge density compared to alkaline earth metals. This results in lower melting and boiling points for alkali metals because less energy is required to overcome the forces holding the metal atoms together. Additionally, alkali metals have only one valence electron, making it easier for them to lose this electron and transition into a liquid or gaseous state.
