Question

Please Give me the Answer ​

Answer 1

Answer:

I) Atomic no. 12

ii). Valency 2

iii) Group 2

iv) Period 3

v) 4Be

Answer 2

Explanation

1 as we know atomic number= number of proton = number of electron so atomic number= numbers of electron so atomic number = 12. ( 2+8+2=12)

2 valency = +2 ie it could shed 2 electron to become stable

3 so by sub shell divisions

$12= 1s² , 2s² , {2p}^{6} \: {3s}^{2}$

Frome here it's s block element

for S block formula = number of valance electron = number of groupe

so groupe = 2nd groupe

4 number of period = number of shell

period = 3 ( coz it has 3 shell K L M )

5. answer is Be((4) coz atomic number 12 and 4 are in same groupe

and property along groupe dies not change