Question
What is the periodic trend in the variation of valency while going down a group? Explain your answer with reference to the group 1, group 2 and group 18.
✓
Answer
| Group 1 | Group 2 | | Group 18 |
| H 1 | | He 2 | |
| Li 2,1 | Be 2,2 | | Ne 2,8 |
| Na 2,8,1 | Mg 2,8,2 | Ar 2,8,8 | |
| K 2,8,8,1 | Ca 2,8,8,2 | | |
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Bhikaji Tambe a farmer in Kolhapur has planned a big harvest of sugarcane in his field. Suggest him ways and means for a high yield with organic farming.
A coil is connected to a galvanometer. When the N-pole of magnet is pushed into the coil, the galvanometer deflected to the right. What deflection, if any, is observed when:
- The N-pole is removed?
- The S-pole is inserted?
- The magnet is a rest in the coil?
Observe the figure and answer the questions:
$i.$ State Newton's universal law of gravitation.
$ii.$ If the distance between the two bodies is tripled, how will the gravitational force between them change?
$iii.$ What will happen to gravitational force, if mass of one of the objects is doubled?
→$i.$ State Newton's universal law of gravitation.
$ii.$ If the distance between the two bodies is tripled, how will the gravitational force between them change?
$iii.$ What will happen to gravitational force, if mass of one of the objects is doubled?
Explain with a ray diagram the position, size, and nature of the various images formed by a convex lens.
An object is in between $F_1$ and $2F_1$
→An object is in between $F_1$ and $2F_1$
Define heredity. Explain the mechanism of hereditary changes.
A dentist’s mirror has a radius of curvature of 3cm. How far must it be placed from a small dental cavity to give a virtual image of the cavity that is magnified five times?
For the circuit shown in the diagram below:
What is the value of :
Current through $6 Ω$ resistor?
Potential difference across $12 Ω$ resistor?
→What is the value of :
Current through $6 Ω$ resistor?
Potential difference across $12 Ω$ resistor?
i. Write two sources of lipids.
ii. How much energy is obtained from lipids?
iii. What is produced after digestion of lipids?
ii. How much energy is obtained from lipids?
iii. What is produced after digestion of lipids?
Observe the given diagram and answer the following questions:
i. What is refraction of light?
ii. Name the emergent ray.
iii. Which two angles are equal?
i. What is refraction of light?
ii. Name the emergent ray.
iii. Which two angles are equal?
If the angle of incidence and angle of emergence of a light ray falling on a glass slab are $i$ and $e$ respectively, prove that, $i = e.$
→