Complete the following table relating to the atomic structure of the element:
Element Atomic No. Mass No. No. of protons No. of neutrons No. of electrons
Aluminium 27 13

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Solution

Atomic number(Z)- The total number of protons in the nucleus of an atom gives us the atomic number of that atom.
Mass number(A)- The number of protons and neutrons combine to give us the mass number of an atom.
Any neutral atom has the same number of electrons as the number of protons.
For a neutral atom Z=atomic number=number of protons=number of electrons.
Here, No. of electrons is 13, so atomic number=number of protons=13
Number of neutrons=A-Z=27-13=14
Hence, the completed table will be-
Element Atomic No. Mass No. No. of protons No. of neutrons No. of electrons
Aluminium 13 27 13 14 13

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Complete the following table relating to the atomic structure of some elements.

$\begin{matrix} Element & Atomic & Mass & Number of & Number of & Number of Symbol & Number & Number & Neutrons & Electrons & Protons L i & 3 & 6 C l & 17 & 20 N a & 12 & 11 A l & 27 & 13 S & 32 & 16 \end{matrix}$

Which of the following statement is correct about the atom of an element ?

(a) an atom can have only protons and neutrons but no electrons.

(b) an atom can have only electrons and neutrons but no protons

(d) an atom must always have a proton, neutron and electron

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	................	................	................	................

Complete the below table:-

Elements	Protons	Electrons	Neutrons	Mass no.
17A35
24B52

Q. Atomic no.of Al is 13 and mass no. is 27.Calculate the number of electrons,protons and neutrons.

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Element	Atomic No.	Mass No.	No. of protons	No. of neutrons	No. of electrons
Aluminium		27			13

Complete the following table relating to the atomic structure of the element:ElementAtomic No.Mass No.No. of protonsNo. of neutronsNo. of electrons Aluminium 27 13

Complete the following table relating to the atomic structure of the element:
Element Atomic No. Mass No. No. of protons No. of neutrons No. of electrons
Aluminium 27 13