[" जात कीजए और शून "],[" (ii) "4s^(2)-4s+1]

solve the equations (i) x^2-2x-8 (ii) 4s^2-4s+1

The electronic configurations of some elements are given below: (i) 1s ^(2) 2s ^(2) 2p ^(6) 3s ^(1) (ii) 1s ^(2) 2s ^(2) 2p ^(6) 3s ^(2) 3p ^(6) 4s ^(2) 3s ^(1) (iii) 1s ^(2) 2s ^(2) 2p ^(3) (iv) 1s ^(2) 2s ^(2) 2p ^(6) 3s ^(2) 3p ^(6) 4s ^(2) (v) 1s ^(2) 2s ^(2) 2p ^(6) 3s^(2) 3p ^(5) (vi ) 1s ^(2) 2s ^(2) 2p^(6) 3s ^(2) 3p ^(3) (vii) 1s^(2) 2s ^(2) 2p^(6) (viii) 1s ^(2) 2s ^(2) 2p ^(6) 3s ^(2) 3p ^(4) Name the elements. Out of these which 1. is an alkaline earth metal 2. has lowest chemical reactivity 3. belong to group 15 of the periodic table 4. is a transition element 5. is halogen 6. belong to p-block 7. belong to second period.

Find the zeroes of the following quadratic polynomials and verify the relationship between the zeroes and the coefficients:(ii) 4s^2-4s+1

Find the zeros of polynomial g(s)=4s^(2)-4s+1 and verify the relationship between the zeros and their coefficients:

""_(21 ) Sc : 1s^(2 ) 2s ^(2) 2p ^(6) 3s^(2)3p ^(6 ) 4s ^(2) 3d^(1) Scandium belongs to which block ?