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What are the atomic numbers of elements whose outermost electrons is represented by 2p3.

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प्रश्न

What are the atomic numbers of elements whose outermost electrons is represented by 2p3.

संख्यात्मक
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उत्तर

2p3

Completing the electron configuration of the element as

1s2 2s2 2p3.

∴ Number of electrons present in the atom of the element = 2 + 2 + 3 = 7

∴ Atomic number of the element = 7

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अध्याय 2: Structure of Atom - EXERCISES [पृष्ठ ७०]

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एनसीईआरटी Chemistry - Part 1 and 2 [English] Class 11
अध्याय 2 Structure of Atom
EXERCISES | Q 2.23 - (ii) (b) | पृष्ठ ७०

संबंधित प्रश्न

Fill in the blanks.

Isotopes are the atoms of ______ element having the ______ atomic number but ______ mass number.


Tick the most appropriate answer.

Which of these have similar chemical properties but different set of physical properties and mass number?

  1. isobars
  2. elements
  3. isotopes
  4. none of these

Fill in the following blanks in respect of an atom of an element 

No. of protons No. of neutron Mass number Atomic number No. of electrons Symbol
11 12 ___________ ___________ ___________ ________

 The mass number of an element is 18. It contains 7 electrons. What is the number of protons and neutrons in it? What is the atomic number of the element?


The mass number of an element is 23 and it contains 11 electrons. What is the number of protons and neutrons in it? What is the atomic number of the element?


From the symbol `""_15^31"P"`, state :
(i) mass number of phosphorus,
(ii) atomic number of phosphorus, and
(iii) electron configuration of phosphorus.


The atom of an element X has 7 electrons in its M shell.
What is the atomic number of element X?


What is the significance of atomic numbers in the modern Periodic Table?


An element A atomic number 7 mass numbers 14
B electronic configuration 2,8,8
C electrons 13, neutrons 14
D Protons 18 neutrons 22
E Electronic configuration 2,8,8,1

State Valency of each element

An element A atomic number 7 mass numbers 14

B electronic configuration 2,8,8

C electrons 13, neutrons 14

D Protons 18 neutrons 22

E Electronic configuration 2,8,8,1

State (i) Valency of each element (ii) which one is a metal (iii) which is non-metal (iv) which is an inert gas


Match the atomic numbers 4,8,10,15 and 19 with the following:

Element with four shells


Match the atomic numbers 4,8,10,15 and 19 with each of the following:

An element which does not form ion 


If an atom ‘A’ has mass number 35 and atomic number 17, state the number of protons, electrons and neutrons it contains.


The diagram represents an isotope of hydrogen [H]. Answer the following:


Atomic no. = 1
Mass no. = 1

Are isotopes atoms of the same element or different elements.


Draw the structure of the following atoms showing the nucleus containing – protons, neutrons and the orbits with the respective electron:

Lithium [At. no. = 3, Mass no. = 7]


Which of the following are true for an element?

  1. Atomic number = number of protons + number of electrons
  2. Mass number = number of protons + number of neutrons
  3. Atomic mass = number of protons = number of neutrons
  4. Atomic number = number of protons = number of electrons

What is mass number of an atom?


The No. of electrons in the outermost shell of the atom of an inert gas ______.


Electrons revolve around the nucleus in definite open shells.


If M is the atomic mass and A is the mass number, then packing fraction is given by ______.


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