Question

An atom contains 3 protons, 3 electrons and 4 neutrons. Find its atomic number, mass number
and valency ?

Answer 1

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A lithium atom contains 3 protons in its nucleus irrespective of the number of neutrons or electrons. Notice that because the lithium atom always has 3 protons, the atomic number for lithium is always 3. The mass number, however, is 6 in the isotope with 3 neutrons, and 7 in the isotope with 4 neutrons

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Answer 2

HEYA!!!

HERE IS YOUR ANSWER DEAR!!!

NO OF PROTONS :3

NO OF ELECTRONS:3

NO OF NEUTRONS:4

AS WE KNOW,
_____^________^

ATOMIC NUMBER =NO OF PROTONS OR NO OF ELECTRONS

=3

MASS NUMBER=NO OF PROTONS +NO OF NEUTRONS

=7

LITHIUM IS THE ONLY ELEMENT THAT HAS ATOMIC NUMBER 3 AND MASS NUMBER 7.

TO FIND VALENCY WE NEED TO GET ELECTRONIC CONFIGURATION OF LITHIUM.

EC=2 1

VALENCY OF ELEMENT= 1 (because in the l shell no of electrons =1)

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@JIYA