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सी.आई.एस.सी.ई.आईसीएसई ICSE Class 7

An Atom Has 13 Protons and 14 Neutrons. What is the Atomic Number of the Atom ? - Chemistry

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प्रश्न

An atom has 13 protons and 14 neutrons.

What is the atomic number of the atom ?

एक पंक्ति में उत्तर
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उत्तर

What is the atomic number of the atom = 13

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अध्याय 4: Atoms, Molecules and Radicals - Additional questions

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सेलिना Concise Chemistry [English] Class 7 ICSE
अध्याय 4 Atoms, Molecules and Radicals
Additional questions | Q 20.1

संबंधित प्रश्न

Why is it not possible to see an atom with naked eyes?


ANSWER IN DETAIL

Enlist the features of Bohr’s model of an atom. How did he correct the Rutherford’s model ?


Write the names of `("NH"_4)_2"SO"_4` compounds:


Fill in the blank

An ion with positive charge is called ______


Name the particle or particles you would expect to find in :

The orbit of an atom


A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.

What is the mass number of X?


Why is it not possible to see an atom even with the most powerful microscope ?


One nm is equal to :


For the symbols H, D and T, write the subatomic particles (protons, neutrons and electrons) found in each one of them.


Elements X and Y have 1 and 7 electrons in their outermost shell respectively.

Which element will gain electron?


Select the correct answer to the statement given below:

The smallest particle of a substance – capable of independent existence and which retains the characteristics of the substance.


Define – Atom.


Project.

To have an idea of what atoms are, students can be asked to construct atoms using pipe cleaners (thin metal wires-electron shells), pompoms (balls-different colours for protons and neutrons) and beads (electrons). Students will love and enjoy putting them together and they look great hanging from the ceiling in the classroom.


Define the following term with an example.

Metalloid


Atoms of different elements having ______ mass numbers, but ______ atomic numbers are called isobars. 


The number of atoms present in a molecule is called its ______.


Dalton’s atomic theory successfully explained

(i) Law of conservation of mass

(ii) Law of constant composition

(iii) Law of radioactivity

(iv) Law of multiple proportions


Atomic models have been improved over the years. Arrange the following atomic models in the order of their chronological order

  1. Rutherford’s atomic model
  2. Thomson’s atomic model
  3. Bohr’s atomic model

Write any two observations which support the fact that atoms are divisible.


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