English

In the atom of an element X, 6 electrons are present in the outermost shell. If it acquires noble gas configuration by accepting requisite number of electrons,

Advertisements
Advertisements

Question

In the atom of an element X, 6 electrons are present in the outermost shell. If it acquires noble gas configuration by accepting requisite number of electrons, then what would be the charge on the ion so formed?

Short/Brief Note
Advertisements

Solution

X – 2e– —> X2-; when an atom has 6 electrons in its outermost shell and it accepts 2 electrons, it gets two negative charges.

shaalaa.com
  Is there an error in this question or solution?
Chapter 4: Structure of the Atom - Short Answer Questions [Page 30]

APPEARS IN

NCERT Exemplar Science Exemplar [English] Class 9
Chapter 4 Structure of the Atom
Short Answer Questions | Q 26. | Page 30

RELATED QUESTIONS

An element has an atomic number of 11 and its mass number is 23. What is the arrangement of electrons in the shells? State nuclear composition of an atom of the element.


The atomic number of an element E is 16. The number of electrons in its ion E2– will be :


The number of electrons in an ion Y2+ is 10. The atomic number of element Y is most likely to be :


The atom of an element X contains 17 protons, 17 electrons and 18 neutrons whereas the atom of an element Y contains 11 protons, 11 electrons and 12 neutrons.

  1. What type of ion will be formed by an atom of element X ? Write the symbol of ion formed.
  2. What will be the number of (i) protons (ii) electrons, and (iii) neutrons, in the ion formed from X ?
  3. What type of ion will be formed by an atom of element Y ? Write the symbol of ion formed.
  4. What will be the number of (i) protons (ii) electrons, and (iii) neutrons, in the ion formed from Y ?
  5. What is the atomic mass of (i) X, and (ii) Y ?
  6. What could the elements X and Y be ?

What is the numerical value of Avogadro number ?


What name is given to the number 6.022 × 1023 ?


What is the number of molecules in 1.5 moles of ammonia ?


If 12 gram of carbon has x atoms, then the number of atoms in 12 grams of magnesium will be :


Which of the following has the maximum number of atoms ?


What weight of oxygen gas will contain the same number of molecules as 56 g of nitrogen gas ?

(O = 16 u ; N = 14 u)


If one gram of sulphur contains x atoms, calculate the number of atoms in one gram of oxygen element.

(Atomic masses : S = 32 u ; O = 16 u)


Classify each of the following on the basis of their atomicity.

  1. F2
  2. NO2
  3. N2O
  4. C2H6
  5. P4
  6. H2O2
  7. P4O10
  8. O3
  9. HCl
  10. CH4
  11. He
  12. Ag

Which has more number of atoms?

100g of N2 or 100 g of NH3


Compute the difference in masses of one mole each of aluminium atoms and one mole of its ions. (Mass of an electron is 9.1×10–28 g). Which one is heavier?


. A sample of ethane (C2H6) gas has the same mass as 1.5 ×1020 molecules of methane (CH4). How many C2H6 molecules does the sample of gas contain?


Match the names of the Scientists given in column A with their contributions towards the understanding of the atomic structure as given in column B

  (A)   (B)
(a) Ernest Rutherford (i) Indivisibility of atoms
(b) J.J.Thomson (ii) Stationary orbits
(c) Dalton (iii) Concept of nucleus
(d) Neils Bohr (iv) Discovery of electrons
(e) James Chadwick (v) Atomic number
(f) E. Goldstein (vi) Neutron
(g) Mosley (vii) Canal rays

The atomic number of calcium and argon are 20 and 18 respectively, but the mass number of both these elements is 40. What is the name given to such a pair of elements?


An element X has a mass number 4 and atomic number 2. Write the valency of this element?


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×