# Each of the statements below attempts to explain why some periodic property varies predictably among elements in the periodic table. Determine if each statement is true or false.Within a period, elements with higher atomic numbers have atoms of smaller radius because the atoms have higher effective nuclear charge.Within a family, elements with higher atomic numbers require less energy to remove an electron from the atom, because the valance electrons are in higher principal energy levels.Within a family, elements with lower atomic numbers have higher electronegativity because the valance electrons are in higher principal energy levels.Within a period, elements with higher atomic numbers have higher ionization energy because the valance electrons are in higher principal energy levels.Within a family, elements with lower atomic numbers have lower ionization energy because the atoms have lower effective nuclear charge.   Within a family, elements with higher atomic numbers have atoms of larger radius because the atoms have lower effective nuclear charge.

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Each of the statements below attempts to explain why some periodic property varies predictably among elements in the periodic table. Determine if each statement is true or false.

Within a period, elements with higher atomic numbers have atoms of smaller radius because the atoms have higher effective nuclear charge.

Within a family, elements with higher atomic numbers require less energy to remove an electron from the atom, because the valance electrons are in higher principal energy levels.

Within a family, elements with lower atomic numbers have higher electronegativity because the valance electrons are in higher principal energy levels.

Within a period, elements with higher atomic numbers have higher ionization energy because the valance electrons are in higher principal energy levels.

Within a family, elements with lower atomic numbers have lower ionization energy because the atoms have lower effective nuclear charge.

Within a family, elements with higher atomic numbers have atoms of larger radius because the atoms have lower effective nuclear charge.

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Step 1

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Step 2

Statement 1: Within a period, elements with higher atomic numbers have atoms of smaller radius because the atoms have higher effective nuclear charge.

True.

Across a period, the atomic number increases which increases the number of electrons in the same shell and also the number of protons in the nucleus. Thus, there is a greater effective nuclear charge due to greater attraction of the electron shell towards the nucleus resulting in smaller radius of the atoms. Hence, the statement is true.

Step 3

Statement 2: Within a family, elements with higher atomic numbers require less energy to remove an electron from the atom, because the valance electrons are in higher principal energy levels.

True.

Within a family or in a group, with the increase in atomic number, that is, while moving down a group, the princi...

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