मराठी
महाराष्ट्र राज्य शिक्षण मंडळएस.एस.सी (इंग्रजी माध्यम) इयत्ता १० वी

The number of electrons in the outermost shell of alkali metals is ______.

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प्रश्न

The number of electrons in the outermost shell of alkali metals is ______.

पर्याय

  • 1

  • 2

  • 3

  • 7

MCQ
रिकाम्या जागा भरा
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उत्तर

The number of electrons in the outermost shell of alkali metals is 1.

Explanation:

Alkali metals belong to Group 1 of the periodic table, which includes elements like lithium, sodium, and potassium. They all have a valence electronic configuration of (ns1). Because they possess exactly one electron in their outermost shell, they easily lose it to form univalent positive ions (M+) and achieve a stable noble gas configuration.

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पाठ 2: Periodic Classification of Element - Exercise [पृष्ठ २८]

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बालभारती Science and Technology Part 1 [English] Standard 10 Maharashtra State Board
पाठ 2 Periodic Classification of Element
Exercise | Q 2. a. | पृष्ठ २८

संबंधित प्रश्‍न

An element P (atomic number 20) reacts with an element Q (atomic number 17) to form a compound. Answer the following questions giving reason:

Write the position of P and Q in the Modern Periodic Table and the molecular formula of the compound formed when P reacts with Q.


Rewrite the following statement after correction, if necessary:

 Isotopes are the elements of the same group.


An element X is in group 2 of the periodic table what will be the formula of its oxide?


An atom has the electron structure of 2, 7.
(a) What is the atomic number of this atom?
(b) To which of the following would it be chemically similar?
7N, 15P, 17Cl, 18Ar
(c) Why would you expect it to be similar?


An element X from group 2 reacts with element Y from group 16 of the periodic table.
(a) What is the formula of the compound formed?
(b) What is the nature of bond in the compound formed?


A metal X is in the first group of the periodic table. What will be the formula of its oxide?


An element X from group 2 of the periodic table reacts with an element Y from group 17 to form a compound.

(a) What is the nature of the compound formed?
(b) State whether the compound formed will conduct electricity or not.
(c) Give the formula of the compound formed.
(d) What is the valency of element X?
(e) How many electrons are there in the outermost shell of an atom of element Y?


Write the names and symbols of two very reactive metals belonging to group 1 of the periodic table. Explain by drawing electronic structure, how either one of the two metals reacts with a halogen. With which name is the bond formed between these elements known and what is the class of the compound so formed known? State any four physical properties of such compounds.


An element X (atomic number 17) reacts with an element Y (atomic number 20) to form a compound.

(a) Write the position of these elements in the modern periodic table.

(b) Write the formula of the compound formed.

Justify your answer in each case.


Rearrange the columns 2 and 3 so as to match with the column 1.

Column 1 Column 2 Column 3
i. Triad a. Lightest and negatively charged particle in all the atoms 1. Mendeleev
ii. Octave b. Concentrated mass and positive charge 2. Thomson
iii. Atomic number c. Average of the first and the third atomic mass 3. Newlands
iv. Period d. Properties of the eighth element similar to the first 4. Rutherford
v. Nucleus e. Positive charge on the nucleus 5. Dobereiner
vi. Electron f. Sequential change in molecular formulae 6. Moseley

(a) How is possible valency of an element determined from the electronic configuration of its atom ?

(b) Determine the valency of an element X whose atomic number is 15. 


Example for liquid metal is ______.


Which one of the following statements is not correct about the trends in the properties of the elements of a period on going from left to right?


The atom of an element has electronic configuration 2, 8, 7. To which of the following elements would it be chemically similar?


Which of the following hydroxides is most basic?


The elements of group 16 are called ______ 


The element with atomic number 26 will be found in group ______ 


Which type of elements are poor conductors of heat and electricity?


Complete the following triads by inserting the missing elements.

Cl, ______, I


Justify. Element 'X' forms an oxide with the formula X2O3 which is a solid with a high melting point. ‘X’ would most likely be placed in the group of the Periodic Table as Al.


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