the element present in first two group of the periodic table are option Highly Nonmetallic
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Answer:
Hydrogen is a unique, nonmetallic element with properties similar to both group 1A and group 7A elements.
Answer:
The alkali metals are in Group 1A (or IA) of the periodic table: Rubidium (Rb), cesium (Cs), francium (Fr), hydrogen (H), lithium (Li), sodium (Na), potassium (K), and Except for hydrogen, these metals are soft, shiny, low-melting, highly reactive, and tarnish when exposed to air. The fact that a basic (alkaline) solution forms when these metals or their oxides are dissolved in water is the source of the name. Since the alkali metals are so reactive, they rarely (if ever) occur in nature in their elemental state. Instead, they are typically found in the form of ionic compounds (with the exception of hydrogen).
In their highest-energy orbitals (ns1), the alkali metals only contain one valence electron. They were the largest elements during their respective periods and had the lowest ionization energies. The ion with the 1+ charge is formed when the valence electron is easily lost.
Except for hydrogen, the alkali metals are solid at room temperature and have relatively low melting points: Rubidium melts at 39 degrees Celsius, cesium at 28 degrees Celsius, sodium at 98 degrees Celsius, potassium at 63 degrees Celsius, and lithium at 181 degrees Celsius. Using a butter knife, you can cut sodium and potassium.
Water tends to be extremely soluble in salts of Group 1A elements. Alkali metal ions are easy to separate from their anions and dissolve in polar solvents like water due to their low charges densities and relatively large size in comparison to other ions of the same period.
With the exception of hydrogen, the alkali metals vigorously react with water to produce metal hydroxide, hydrogen gas, and heat.
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