Explain about periods in modern periodic table .......
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The periodic table has undergone extensive changes in the time since it was originally developed by Mendeleev and Moseley. Many new elements have been discovered, while others have been artificially synthesized. Each fits properly into a group of elements with similar properties. The periodic table is an arrangement of the elements in order of their atomic numbers so that elements with similar properties appear in the same vertical column or group.
The figure below shows the most commonly used form of the periodic table. Each square shows the chemical symbol of the element along with its name. Notice that several of the symbols seem to be unrelated to the name of the element: Fe for iron, Pb for lead, etc. Most of these are the elements that have been known since ancient times and have symbols based on their Latin names. The atomic number of each element is written above the symbol
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The periodic table has undergone extensive changes in the time since it was originally developed by Mendeleev and Moseley. Many new elements have been discovered, while others have been artificially synthesized. Each fits properly into a group of elements with similar properties. The periodic table is an arrangement of the elements in order of their atomic numbers so that elements with similar properties appear in the same vertical column or group.
The figure below shows the most commonly used form of the periodic table. Each square shows the chemical symbol of the element along with its name. Notice that several of the symbols seem to be unrelated to the name of the element: Fe for iron, Pb for lead, etc. Most of these are the elements that have been known since ancient times and have symbols based on their Latin names. The atomic number of each element is written above the symbol
please give me as brainlist
sarthakshree:
please give me as brainlist
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please give me as brainlist
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Sarthak shree
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● There are 7 periods in periodic table. First period comprised two elements it known as very short period.
● second period is known as short period it comprises of 8 elements (Lithium to neon).
● third period is known as short period it comprises of 8 elements. ( Na to Ar )
● 4th period is known as Long period it comprises of 18 element. (K toKr)
● 5th period is known as Long period it comprises of 18 element. (Rb to Xe)
● 6th period is known as very long period it comprises of 32 elements. (Ce to Ra)
● 7th period is known as incomplete period it comprises of 28 elements. (Fr to Uuh)
● across the period elements are arrange in increasing order of atomic number.
● number of electron increases in valence shell for elements in period but number of cells does not change.
● whenever electron enters in a new cell a new period or Uriginates in periodic table.
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● There are 7 periods in periodic table. First period comprised two elements it known as very short period.
● second period is known as short period it comprises of 8 elements (Lithium to neon).
● third period is known as short period it comprises of 8 elements. ( Na to Ar )
● 4th period is known as Long period it comprises of 18 element. (K toKr)
● 5th period is known as Long period it comprises of 18 element. (Rb to Xe)
● 6th period is known as very long period it comprises of 32 elements. (Ce to Ra)
● 7th period is known as incomplete period it comprises of 28 elements. (Fr to Uuh)
● across the period elements are arrange in increasing order of atomic number.
● number of electron increases in valence shell for elements in period but number of cells does not change.
● whenever electron enters in a new cell a new period or Uriginates in periodic table.
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