MCQ
What is the valence electron in alkali metal?
  • A
    F-electron
  • B
    P-electron
  • C
    S-electron
  • D
    D-electron

Answer

  1. S-electron

Explanation:

The valence electron in an alkali metal is an s-electron.

Generally, they make up Group 1 of the periodic table.

The different examples that come under this category are lithium, potassium, and francium.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

The band gap in Germanium and silicon in eV respectively is

(a) 0.7, 1.1

(b) 1.1, 0.7

(c) 1.1, 0 

(d) 0, 1.1

A varying current in a coil changes from 10 amp to zero in 0.5 sec. If average EMF is induced in the coil is 220 volts, the self inductance of coil is

(a) 5 H

(b) 10 H

(c) 11 H

(d) 12 H

Electric field of one plane progressive electromagnetic wave is $E_Z=100 \cos (6$ $\left.\times 10^8 t+4 x\right) Vm ^{-1}$. Then refractive index of medium of propagation would be __________ .
A capacitor of capacitance C is charged to a potential V. The flux of the electric field through a closed surface enclosing the capacitor is:

Energy levels A, B, C of a certain atom corresponding to increasing values of energy i.e. . If  are the wavelengths of radiations corresponding to the transitions C to B, B to A and C to A respectively, which of the following statements is correct

(a)  

(b)  

(c)  

(d)  

The direction of the null points is on the equatorial line of a bar magnet, when the north pole of the magnet is pointing

(a) North

(b) South

(c) East

(d) West

Let V and E denote the gravitational potential and gravitational field at a point. It is possible to have:
  1. V = 0 and E = 0
  2. V = 0 and E ≠ 0
  3. V ≠ 0 and E = 0
  4. V ≠ 0 and E ≠ 0
Shows the elliptical path of a planet about the sun. The two shaded parts have equal area. If t1 and t2 be the time taken by the planet to go from a to b and from c to d respectively:

  1. t1 < t2
  2. t1 = t2
  3. t1 > t2
  4. Insufficient information to deduce the relation between t1 and t2.

Which of the following is incorrect statement regarding photon

(a) Photon exerts no pressure

(b) Photon energy is hv

(c) Photon rest mass is zero

(d) None of these

A person shines a coherent light of a bulb through an object, A, which produces a pattern of concentric rings on a screen, B. A is most likely: