Unit-4 Periodic Table and Periodicity of Properties
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Unit-4 Periodic Table and Periodicity of Properties
Answer: Ionization energy is the energy needed to remove one electron from an atom.
Answer: Germanium is a metalloid located near the staircase line.
Answer: Electron affinity is the energy change when a neutral atom accepts an electron.
Answer: Metalloids border the staircase line separating metals from non-metals.
Answer: Electronegativity measures how strongly an atom attracts bonding electrons.
Answer: The zigzag line divides metallic and non-metallic elements.
Answer: Fluorine is the most electronegative element on the periodic table.
Answer: He used similarities in properties to correct inaccurate atomic masses.
Answer: Metallic character decreases across a period as non-metallic character rises.
Answer: Moseley showed element position depends on nuclear charge, i.e., atomic number.
Answer: Down a group, atoms lose electrons more easily, so metallic character increases.
Answer: Atomic number 3 corresponds to lithium.
Answer: Group 1 elements are known as alkali metals.
Answer: Group 15 is the nitrogen (pnictogen) family.
Answer: Group 2 elements are the alkaline earth metals.
Answer: Hydrogen has atomic number 1 and opens the table.
Answer: Group 18 elements are inert or noble gases.
Answer: The fourth period is a long period containing 18 elements.
Answer: Sodium is in Group 1, making it an alkali metal.
Answer: Neon is a noble gas in Group 18.