Question

The number of elements in the fourth period of the periodic table is

Answer 1

the no of elements in fourth period of periodic table is 18

Answer 2

${\fbox{\fbox{\huge\sf\red{☞QuesTiOn}}}}$

$\sf\green{→The\: number\: of \:elements \:in\: the}$$\sf\green{ fourth \:period \:of\: the\: periodic\: table\: is}$

${\fbox{\fbox{\huge\sf\pink{☞Answer:-}}}}$

☞There are 18 elements in 4th period of periodic table .

${\fbox{\fbox{\huge\sf\purple{☞Know\:More}}}}$

☞Periods are the 7 horizontal rows in the periodic table.

1)First period :-

$\sf\orange{→It\: contains\: only\: two \:elements\: Hydrogen}$$\sf\orange{\: and\: Helium. So, \:it\: is\: called\: as\: the\:}$ Shortest period.

2)Second period :-

$\sf\blue{→It\: contains\: 8 \:elements – Li , Be , B , C , N , O , }$$\sf\blue{F ,Ne.So, it\: is\: called \:}$Short period.

3)Third Period :-

$\sf{→It \:also \:contains\: 8 \:elements\: – Na , Mg , }$$\sf{ Al , Si , P , S , Cl , Ar.It\: is \:also\: known\: as}$ Short period.

4)Forth period :-

$\sf\red{→It \:contains\: 18 \:elements\: K\: to \:Kr.}$$\sf\red{ So , it\: is\: known\: as \:}$Long period.

5)Fifth Period :-

$\sf\pink{→It \:also \:contains \:18 \:elements \:Rb \:to \:Xe.}$ $\sf\pink{So, it \:is \:also\: called\:}$ Long period.

6)Sixth period :-

$\sf\green{→It \:contains \:32 \:elements\: Cs \:to\: Rn. }$$\sf{So,\: it \:is\: the\:}$ Longest period.

7)Seventh period :-

$\sf\purple{→It\: contains \:31 \:elements\: and\: it \:is \:an}$ Incomplete period.