Physical And Chemical Properties Of Group 1 Elements Pdf
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Group 1 contains elements placed in a vertical column on the far left of the periodic table. The elements in group 1 are called the alkali metals. The alkali metals share similar physical and chemical properties.
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This page discusses the trends in some atomic and physical properties of the Group 1 elements - lithium, sodium, potassium, rubidium and cesium. Sections below cover the trends in atomic radius, first ionization energy, electronegativity, melting and boiling points, and density. The positive charge on the nucleus is canceled out by the negative charges of the inner electrons. This effect is illustrated in the figure below:. This is true for each of the other atoms in Group 1.
Potassium, Physical and Chemical Properties
Alkali metals are chemical elements from the s-block of the periodic table. They have homologous physical and chemical properties. The alkali metals are a group of chemical elements in the periodic table with the following physical and chemical properties:. They can all be cut easily with a plastic knife due to their softness, and their shiny surface tarnishes rapidly in air due to oxidation. Because of their high reactivity, alkali metals must be stored under oil to prevent reaction with air. In the modern IUPAC nomenclature, the alkali metals comprise the group 1 elements, excluding hydrogen. All the alkali metals react with water, with the heavier alkali metals reacting more vigorously than the lighter ones.
The alkali metals consist of the chemical elements lithium Li , sodium Na , potassium K , [note 1] rubidium Rb , caesium Cs , [note 2] and francium Fr. Together with hydrogen they constitute group 1 , [note 3] which lies in the s-block of the periodic table. All alkali metals have their outermost electron in an s-orbital : this shared electron configuration results in their having very similar characteristic properties. This family of elements is also known as the lithium family after its leading element. They can all be cut easily with a knife due to their softness, exposing a shiny surface that tarnishes rapidly in air due to oxidation by atmospheric moisture and oxygen and in the case of lithium, nitrogen. Because of their high reactivity, they must be stored under oil to prevent reaction with air, and are found naturally only in salts and never as the free elements. Caesium, the fifth alkali metal, is the most reactive of all the metals.
Alkali metal , any of the six chemical elements that make up Group 1 Ia of the periodic table —namely, lithium Li , sodium Na , potassium K , rubidium Rb , cesium Cs , and francium Fr. The alkali metals are so called because reaction with water forms alkalies i. Sodium and potassium are the sixth and seventh most abundant of the elements, constituting , respectively, 2. The other alkali metals are considerably more rare, with rubidium, lithium, and cesium, respectively, forming 0.
General introduction to the Group 1 Alkali Metals. What are the important trends down Group 1 Alkali Metals. Selected data on the Group 1 Alkali Metals. Explaining the alkali metal reactivity trend.
Remember Me. The alkali metals make up Group 1 of the periodic table. This family consists of the elements lithium, sodium, potassium, rubidium, cesium, and francium Li, Na, K, Rb, Cs, and Fr, respectively.
In some groups, the elements display very similar chemical properties and some of the groups are even given special names to identify them. The characteristics of each group are mostly determined by the electron configuration of the atoms of the elements in the group. The names of the groups are summarised in Figure 5.
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