Question

an atom has 11 protons and 12 neutrons .write its atomic number, mass number and electronic configuration.

Answer 1

Number of Proton = Atomic number
So,
Atomic number =11

Mass number=proton + neutrons
Mass number=11+12= >23

Electronic configuration=2,8,1(11)


Name of element is Sodium

Answer 2

Answer: Atomic number $= 11$, Mass number $= 23$ and Electronic configuration = $2, 8, 1$

Explanation:

Atomic number (Z) of an element is equal to the number of protons present in it.

$Z = Number of protons$

Mass number (A) of an element is equal to the number of protons and neutrons (N) present in it.

$A = Z + N$

As the atom has $11$ protons, therefore atomic number is also $11$ $(Z = 11)$.

As the atom has $11$ protons and $12$ neutrons, therefore its mass number is $23$ $(A = Z + N = 11 + 12 = 23)$.

Electronic configuration of an atom shows the distribution of electrons in it and the number of electrons in an atom is equal to its atomic number.

Electronic configuration = $2, 8, 1$

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