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level: Periodic table and trends

Questions and Answers List

level questions: Periodic table and trends

QuestionAnswer
Define electronegativityThe tendency for an atom of a given chemical element to attract shared electrons when forming a chemical bond
Define ionisation energyThe amount of energy required to remove an electron from an isolated atom or molecule.
Define valencyThe ability of an atom to form chemical bonds with other atoms
What is the trend of ionisation energy?Ionization energy increases moving from left to right across an element period (This is due to valence shell stability). Ionization energy of the elements within a group generally decreases from top to bottom (This is due to electron shielding).
What is the trend of electronegativityElectronegativity decreases down a group and increases across a period
What is the trend of valency?Valency first increases and then decreases as we go from left to right in a period but remains the same in a group.
Define a metallic elementAny chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc
Define non-metallic elementsA chemical element (such as boron, carbon, or nitrogen) that lacks the characteristics of a metal.
Define an alkali metalVery reactive chemical species that readily lose their one valence electron to form ionic compounds with nonmetal elements
Define a halogenThey are reactive non-metallic elements that form strongly acidic compounds with hydrogen.