Download App

Periodic Classification of Elements — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10SciencePeriodic Classification of Elements5 Marks
Question
Atomic number of a few elements are given below:
10, 20, 7, 14
  1. Identify the elements.
  2. Identify the Group number of these elements in the Periodic Table.
  3. Identify the Periods of these elements in the Periodic Table.
  4. What would be the electronic configuration for each of these elements?
  5. Determine the valency of these elements.
✓

Answer

Atomic Number
10
20
7
14
Element
Neon
Calcium
Nitrogen
Silicon
Group Number
(8 + 10) = 18
2
(5 + 10) = 15
(4 + 10) = 14
Period Number
 $2^{\text {nd }}$ $4^{\text {th }}$ $2^{\text {nd }}$ $3^{\text {rd }}$
Electronic Configuration
2, 8
2, 8, 8, 2
2, 5
2, 8, 4
Valency
Zero
2
(8 - 5) = 3
4

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

Explore more

More "[5 marks Questions]" from Periodic Classification of Elements→Periodic Classification of Elements — all question types→Science STD 10 question papers→CBSE Board STD 10 question papers→CBSE Board question paper generator→

Similar questions

What is meant by power of a lens? Define its S.I. unit. You have two lenses A and B of focal lengths +10 cm and –10 cm respectively. State the nature and power of each lens. Which of the two lenses will form a virtual and magnified image of an object placed 8 cm from the lens? Draw a ray diagram to justify your answer.
→
Explain the term fission as used in relation to reproduction.
→
Analyse the following observation table showing variation of image-distance (v) with object-distance (u) in case of a convex lens and answer the questions that follow without doing any calculations:
S. No. Object-Distance
u (cm)		 Image-Distance
v (cm)
1. -60 +12
2. -30 +15
3. -20 +20
4. -15 +30
5. -12 +60
6. -9 +90
  1. What is the focal length of the convex lens? State reason for your answer.
  2. For what object-distance (u) is the corresponding image-distance (v) not correct? How did you arrive at this conclusion?
  3. Choose an appropriate scale to draw a ray diagram for the observation at S. No. 4 and find the approximate value of magnification.
→
An electric circuit consisting of a 0.5m long nichrome wire XY, an ammeter, a voltmeter, four cells of 1.5V each and a plug key was set up.
  1. Draw a diagram of this electric circuit to study the relation between the potential difference maintained between the points ‘X’ and ‘Y’ and the electric current flowing through XY.
  2. Following graph was plotted between V and I values:
What would be the values of ratios when the potential difference is 0.8V, 1.2V and 1.6V respectively? What conclusion do you draw from these values?
  1. What is the resistance of the wire?
→
→
With the help of labelled diagram explain the general scheme to illustrate how nervous impulses travel in the body?
→
The flask-shaped organ A at the centre of a flower is surrounded by a number of little stalks B having swollen tops which lie just inside the ring of petals.
  1. Name A. What are the various parts of A?
  2. Which part of A contains gametes?
  3. Name B. What is the swollen top of B known as?
  4. What does the swollen top of b contain?
  5. Out of A and B, which one is (i) male part, and (ii) female part of the flower?
→
Define pollination. Explain the different types of pollination. List two agents of pollination? How does suitable pollination lead to fertilization?
→
What is meant by:
  1. Displacement reaction, and
  2. Double displacement reaction? Explain with the help of one example each.
→
i. Compare soaps and detergents on the basis of their composition and cleansing action in hard water.
ii. What happens when ethanol is treated with sodium metal? State the behaviour of ethanol in this reaction.
iii. Draw the structure of cyclohexane.
iv. Name the following compound.
Image
→