Question

element x y z are having atomic number 11 17 and 18 respectively write their electronic configuration and their groups and periods​

Answer 1

Answer:

Atomic no. of X = 9

Electronic configuration = 2,7

Valence electrons = 7

Valency of X=1

Atomic no. of element Y = 11

Electronic configuration of Y = 2,8,1

Valency of Y= 1

Atomic no. of element Z = 17

Electronic configuration of Z = 2,8, 7

Valency of Z=1

The element X and Z have same number of valence electrons and since chemical properties depends on the valence electrons. So, Element X and Z will show similar chemical properties

Answer 2

Answer:element x=sodium  ,electronic configuration=2,8,1  ;group no=1  ;period=3

element y=chlorine ,E.C=2,8,7 ;group no=17 ;period=3

element z=argon,E.C=2,8,8 ;group no=18 ;period=3

Explanation:

group no=no of valence elctron in an atom(from 1 valence electron to 2 valence electron-1st group and 2nd group) but from 3 to 8 valence electron we add +10 in valence electron present in an atom we get group no

period no=no of valence shells present in an atom