Download App

P-1 Periodic Classification of Element — Science STD 10 — Question

Maharashtra BoardEnglish MediumSTD 10ScienceP-1 Periodic Classification of Element5 Marks
Question
Answer the questions based on Modern Periodic table.
(i) Go through the Modern Periodic table (fig 2.1) and write the names one below the other of the elements of group 1.
(ii) Write the electronic configuration of the first four elements in this group.
(iii) What similarity do you find in their electronic configuration?
(iv) How many valence electrons are there in each of these elements?
✓

Answer

(i) H
Li
Na
K
Rb
Cs
Fr are the elements of group 1.
(ii)
ElementAtomic No.Electronic configuration
KLMN
H11   
Li321  
Na11281 
K192881

(iii) The outermost shell contains one electron in all these elements.
(iv) Number of valence electrons in each of the elements is 1.

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 "Answer the following questions: [5 M]" from P-1 Periodic Classification of Element→P-1 Periodic Classification of Element — all question types→Science STD 10 question papers→Maharashtra Board STD 10 question papers→Maharashtra Board question paper generator→

Similar questions

(i) Determine the SI unit of the universal constant of gravitation from the formula for the gravitational force between two particles. Hence, state the CGS unit of the constant of gravitation. (ii) Define G (universal gravitational constant)
→
Draw a neat labelled diagram: Electrolytic reduction of alumina.
→
When a female child is born, her ovaries already contain thousands of immature eggs (or ova) contained in immature structures A. On maturing, A bursts open and an egg shoots out of the ovary in a process called B. The process B starts in the females at puberty and occurs again and again after a time period x. Before every occurrence of process B, the inner lining of uterus becomes thick and soft with lots of blood vessels in it. When the egg cell gets fertilised by a sperm, then an event C occurs in the life of mature human female which lasts for time period y leading to the birth of baby. If, however, the egg cell released by the ovary does not get a sperm to fuse with, then the thick and soft inner lining of uterus breaks down and comes out of the female's body in an event called D. The occurrence of event D is controlled by chemical substances E.
  1. What are A?
  2. What is process B?
  3. What is the time period x?
  4. Name the event C.
  5. How much is the time period y?
  6. What is the name of process D?
  7. Name the chemical substances E.
→
Give scientific Reason :
Atomic radius goes on decreasing while going from left to right in a period.
→
State the advantages and disadvantages of using solar cells.
→
The human body has an organ A which acts as a double pump. The oxygenated blood coming from the lungs through a blood vessel B enters the upper left chamber C of the double pump. When chamber C contracts, then blood goes into lower left chamber D. The contraction of chamber D forces the blood to go into a blood vessel E which supplies oxygenated blood to all the organs of the body (except the lungs). The deoxygenated blood coming out of the body organs is taken by a blood vessel F to the right upper chamber G of pumping organ. Contraction of chamber G forces the deoxygenated blood into right lower chamber H. And finally the contraction of chamber H sends the deoxygenated blood into lungs through a blood vessel I.
  1. What is organ A?
  2. Name the blood vessel (i) B (ii) E (iii) F, and (iv) I.
  3. What are chambers (i) C, and (ii) D?
  4. What are chambers (i) G and (ii) H?
→
Sketch, labell and classify: Wall Lizard
→
(Cultural, agriculture, fire, brain, Cro-Magnon, Homo sapiens, Neanderthal)
Evolution of upright man continued in the direction of developing its ………. for the period of about 1 lakh years and meanwhile he discovered the ………. Brain of man, 50 thousand years ago had been sufficiently evolved to the extent that it could be considered as member of the species ………… Neanderthal man can be considered as the first example of wise-man. The ……….. man evolved about 50 thousand years ago and afterwards, this evolution had been faster than the earlier. About 10 thousand years ago, wise-man started to practise the ………. It started to rear the cattle-herds and established the cities. ………..development took place later.
→
 What is meant by latent heat? How will the state of matter transform if latent heat is given off?
→
Explain structure of modern periodic table in short.
→