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The group proposing that elements within the same group have the same electron configurations in their valence shell, which is the most important factor in accounting for their similar properties. Elements in the same group also show patterns in their atomic radius, ionization energy, and electronegativity. From top to bottom in a group, the atomic radii of the elements increase. Since there are more filled energy levels, valence electrons are found farther from the nucleus. From the top, each successive element has a lower ionization energy because it is easier to remove an electron since the atoms are less tightly bound. Similarly, a group will also see a top to bottom decrease in electronegativity due to an increasing distance between valence electrons and the nucleus.

While, the elements in the same period show trends in atomic radius, ionization energy, electron affinity, and electronegativity. Moving left to right across a period, atomic radius usually decreases. This occurs because each successive element has an added proton and electron which causes the electron to be drawn closer to the nucleus. This decrease in atomic radius also causes the ionization energy to increase when moving from left to right across a period. The more tightly bound an element is, the more energy is required to remove an electron. Similarly, electronegativity will increase in the same manner as ionization energy because of the amount of pull that is exerted on the electrons by the nucleus. Electron affinity also shows a slight trend across a period. Metals (left side of a period) generally have a lower electron affinity than nonmetals (right side of a period) with the exception of the noble gases.

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14y ago
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9y ago

The two properties that the modern Periodic Table is based on are chemical and physical properties. The elements that have these properties in common are usually grouped with one another.

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8y ago

1) It is based on atomic number rather than Atomic Mass.

2) It is most accurate and widely used table.

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11y ago

Elements in the same column share the same number of valence electrons. Elements in the same row share the same number of energy levels.

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dont know Google it

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13y ago

Moseley

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Q: What two properties is the modern periodic table based on?
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Related questions

What is the modern periodic table based on?

Modern periodic table is based on modern periodic law which states that physical and chemical properties of elemnts are periodic function of their atomic numbers.


How does the modern periodic arrange the elements?

The modern Periodic Table arranges elements based on properties. These properties include valence electrons of the elements and density for example.


What are the properties based on modern periodic table?

Properties of elements are periodic function of atomic number. Elements with same chemical properties are grouped together.


How are the atoms on the periodic table arranged?

The elements on the modern periodic table are arranged based on the increasing order of atomic number and repeating properties.


What two properties are the modern periodic table based upon?

Mendeleev created the first periodic table based on atomic weight. He observed that many elements had similar properties, and that they occur periodically, hence the name, periodictable. From this, he made the periodic law.


Is the modern periodic table organized by atomic number?

Yes.The modern Periodic Table is organized by atomic number. The elements properties are found to be periodic.


Is The modern periodic table is organized by atomic number?

Yes.The modern periodic table is organized by atomic number. The elements properties are found to be periodic.


How does lead's position in the periodic table relate to its properties?

what is lead's position on the periodic table, and it's chemical properties based on that position


What two properties are the modern periodic table based on?

Properties of elements are periodic function of atomic number. Elements with same chemical properties are grouped together.


What is the similarities in the modern periodic table and Mendeleev's table?

They have simliar properties and same elements although later on more elements were added to the modern periodic table.=Both periodic tables have elements grouped by similar properties. Mendeleev's periodic table had elements arranged in order of increasing atomic mass in columns with similar properties. While many of the elements are in order of atomic mass on the modern periodic table, some are not, as the modern table has elements arranged in order of increasing atomic number.=


State the periodic law on which Mendeleev's Periodic table was based and why and how this periodic law changed?

mendaleev went by atomic #, where as the modern table goes bt atomic mass. answer it?


How are elements on the periodic table divided?

The modern periodic table is arranged in the increasing order of their atomic number and repeating properties.