Question

The atomic mass of an atom is 23 & its atomic number is 11 the atom has dash neutral

Answer 1

sodium has atomic mass 23 and atomic number is 11

Answer 2

$<b><u>Hey mate!! Here's your answer.</u>$
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We know that the atomic number of any element is the number of electrons which is equal to the number of protons.

And, the atomic mass of an element is the total number of protons and neutrons.

Then, an atom with atomic number 11 and atomic mass 23 has -

# 11 protons (because atomic number is 11)

# 11 electrons (because atomic number is 11)

# Now, atomic mass = number of proton + number of neutrons

=> 23 = 11 + number of neutrons

=> number of neutrons = 23 - 11

Hence, number of neutrons is 12

#Extra information - This atom is Sodium (Na)
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Hence, your answer is

$\boxed{\bold{\red{\mathcal{12\: neutrons}}}}$
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$\huge{\bold{\blue{\mathfrak{Thank\: you}}}}$