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

Number of protons Number of neutrons Mass number Atomic number Number of electron Valency

11 12 ............. ............. ............. .............

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Solution

No. of protons No. of neutrons Mass no. Atomic no. No. of electrons Valency

11 12 23 11 11 1

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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 following table relating to the atomic structure of some elements.

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

Complete the following table.

Atomic number	Mass number	Number of Neutrons	Number of protons	Number of electrons	Name of the Atomic species
9	−	10	−	−	−
16	32	−	−	−	Sulphur
−	24	−	12	−	−
−	2	−	1	−	−
−	1	0	1	0	−

Fill in the following blanks :

Atomic Number	Mass Number	Protons	Neutrons	Electrons	Symbol
10	22	................	................	................	................

Question 19
Complete the following table.
$\begin{matrix} Atomic number & Mass number & Number of neutrons & Number of protons & Number of electrons & Name of the atomic species 9 & - & 10 & - & - & - 16 & 32 & - & - & - & Sulphur - & 24 & - & 12 & - & - - & 2 & - & 1 & - & - - & 1 & 0 & 1 & 0 & - \end{matrix}$

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No. of protons	No. of neutrons	Mass no.	Atomic no.	No. of electrons	Valency
11	12	23	11	11	1

Fill in the following blanks in respect of an atom of an element : Number of protons Number of neutrons Mass number Atomic number Number of electron Valency 11 12 ............. ............. ............. .............

No. of protons No. of neutrons Mass no. Atomic no. No. of electrons Valency 11 12 23 11 11 1

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

Number of protons Number of neutrons Mass number Atomic number Number of electron Valency

11 12 ............. ............. ............. .............

No. of protons No. of neutrons Mass no. Atomic no. No. of electrons Valency

11 12 23 11 11 1