[" ii) "4s^(2)-4s+1],[" v) "t^(2)-15]

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.

Name the element with the following electronic configurations . (a) 1s^(2)2s^(2) 2p^(6) 3s^(2) 3p^(1) (b) 1s^(2) 2s^(2) 2p^(6) 3s^(2) 3p^(6) 4s^(1) (c ) 1s^(2) 2s^(1) 2p^(6) 3s^(2) 3p^(6) 3d^( 5) 4s^(1)

Simplify each of the following 4st (s -t) - 6s^(2)(t - t^(2)) - 3t^(2) (2s^(2) - s) + 2st(s - t)

Name the element with the following electronic configurations . (a) 1s^(2)2s^(2) 2p^(6) 3s^(2) 3p^(1) (b) 1s^(2) 2s^(2) 2p^(6) 3s^(2) 3p^(6) 4s^(1)

Let s_(1),s_(2),s_(3),... and t_(1),t_(2),t_(3)... are two arithmetic sequences such that s_(1)=t_(1)!=0,s_(2)=2t_(2) and sum_(i=1)^(10)s_(1)=sum_(i=1)^(15)t_(1) Then the value of (s_(2)-s_(1))/(t_(2)-t_(1)) is

Charge through a cross-section of a conductor is given by Q = 5t^(2) - 2t coulomb . Find the average current through the conductor in the interval t_(1) = 2s to t_(2) = 4s (1) 14s (2) 28 A (3) 56A (4) 7A

Charge through a cross-section of a conductor is given by Q = 5t^(2) - 2t coulomb . Find the average current through the conductor in the interval t_(1) = 2s to t_(2) = 4s (1) 14s (2) 28 A (3) 56A (4) 7A

The area bounded by the curve a^2y=x^2(x+a) and the x-axis is (a^2)/3s qdotu n i t s (b) (a^2)/4s qdotu n i t s (3a^2)/4s qdotu n i t s (d) (a^2)/(12)s qdotu n i t s