how do the following properties vary in a period and in a group of periodic table a)electropositivity b)atomic radius
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In case of periods, atomic radiusdecreases as we towards right. Hence, protons exert more force on the electrons making it difficult to remove an electron. Thus, ionization increases from left to right in a period. Electronegativity: it refers to the ability of an atom to attract electron so as toform an ionic bond.
nitty98:
write two advantage of classifying energy source as renewable and non renewable
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The main advantages of non-renewable energies is that they are abundant and affordable. For example, oil and diesel are still good choices for powering vehicles. Non-renewable energy is cost effective and easier to product and use.
One major advantage of renewable energy is that it is sustainable and will never run out. They provide clean energy because they are non-pollutant and non-contributor to greenhouse effects and global warming. Renewable energy facilities generally require less maintenance than traditional generators.
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explain any three with an example to support evidence in factor of evolution
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ancient organism remains, fossil layers, similarities among organisms alive today, similarities in DNA, and similarities of embryos.
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atomic size Inc in group whereas decrease in period, electronegativity Inc along period and Dec along group
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