Give a characterstics ofperiod
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- in modern periodic table 7 horizontal rows called periods
- each period starts with alkali metals and ends with inert gases
- periods are having elements like this
- 1_2(shortestperiod)
- 2_8(short)
- 3_8(short)
- 4_18(long)
- 5_18(long)
- 6_32(longest)
- 7-31(incomplete)
- 6 period contains lanthanoids
- 7 period contains actinoids
- only gaseous elements in 1 period
- each period represents shell number
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CHARACTERISTICS OF PERIODS
Valence Electrons (or Outermost Electrons)
On moving from left to right in a period, the number of valence electrons in elements increases from 1 to 8.
Valency
On moving from left to right in each short period, the valency of elements increases from 1 to 4. Then decreases to 0 (zero).
Size of Atoms (or Atomic size)
On moving from left to right in a period, the size of atoms(atomic size) decreases.
Metallic Character
On moving from left to right in a period, the metallic character of elements decreases, whereas the non-metallic character increases.
Chemical Reactivity
On moving from left to right in a period, the chemical reactivity of elements first decreases and then increases.
ChemicalReactivity
Valence Electrons (or Outermost Electrons)
On moving from left to right in a period, the number of valence electrons in elements increases from 1 to 8.
Valency
On moving from left to right in each short period, the valency of elements increases from 1 to 4. Then decreases to 0 (zero).
Size of Atoms (or Atomic size)
On moving from left to right in a period, the size of atoms(atomic size) decreases.
Metallic Character
On moving from left to right in a period, the metallic character of elements decreases, whereas the non-metallic character increases.
Chemical Reactivity
On moving from left to right in a period, the chemical reactivity of elements first decreases and then increases.
ChemicalReactivity
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