हिंदी

Right or wrong sentence. The number of shields decreases as the calculation goes down from top to bottom.

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प्रश्न

Right or wrong sentence.

The number of shields decreases as the calculation goes down from top to bottom.

विकल्प

  • Right

  • Wrong

MCQ
सत्य या असत्य
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उत्तर

The given sentence is wrong.

Explanation:

As one goes down a group in the periodic table, the number of electron shells increases because each successive element occupies the next higher principal energy level (period), so atoms lower in the group have more shells (e.g., Li vs Na).

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अध्याय 2: Periodic Classication of Element - Right or Wrong sentence [पृष्ठ २०]

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एससीईआरटी महाराष्ट्र Science and Technology Part 1 [English] Standard 10 Maharashtra State Board
अध्याय 2 Periodic Classication of Element
Right or Wrong sentence | Q 15. | पृष्ठ २०

संबंधित प्रश्न

Write down the electronic configuration of the following elements from the given atomic numbers. Answer the following question with explanation.
 11Na, 15P, 17Cl, 14Si, 12Mg Which of these has largest atoms?


Write down the electronic configuration of the following elements from the given atomic numbers. Answer the following question with explanation.
 19K, 3Li, 11Na, 4Be Which of these atoms has smallest atomic radius?


An element has its electron configuration as 2, 8, 2. Now answer the following question.

What is the atomic number of this element?


An element has its electron configuration as 2, 8, 2. Now answer the following question. 

Which of the following elements would this element resemble?
(Atomic numbers are given in the brackets)

N(7), Be(4), Ar(18), Cl(17)


______ is the outermost shell for elements of period 2.


Which among the following elements would lose an electron easily?


Find the odd one out and give its explanation.


Answer the following question in one sentence.

What determines the chemical reactivity of elements?


The number of electrons in the outermost shell of an atom determines the ______.


Write the name.

The element having stable electron configuration from the third period.


Right or wrong sentence.

The valency of the elements in group 2 is 1.


Right or wrong sentence.

The elements lithium and beryllium are in the same period because their valencies are similar.


Write an explanation.

Group


Distinguish between:

Group - Period


Observe the given chart and answer the questions given below.

Element A B C D
Electronic configuration 2, 1 2, 8 2, 8, 1 2, 8, 8
  1. Which elements are in the same row?
  2. Which elements have the same column?
  3. Which elements are in the 18th column?
  4. Which element is more reactive among A and C?
  5. Which of the following elements A or B will form compounds?

Make a chart which shows the name of the element, valency, atomic number, electronic configuration in the 2nd row of the modern periodic table and arrange these elements in ascending order of atomic mass.


What is the electronic configuration of K19?


An element has its electron configuration as 2, 8, 1. Now answer the following questions:

  1. What is the atomic number of this element?
  2. What is the group of this element?
  3. To which period does this element belong?

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