Question

(4) The atomic number of sodium is 11 and its mass number is 23. It has…...................

A) 11 neutron and 12 protons
B) 12 protons and 11 neutrons
C) 11 electron and 12 neutrons
D) 12 electrons and 11 neutrons​

Answer 1

Answer:

The mass number of an element tells us the number of protons AND neutrons in an atom (the two particles that have a measurable mass). Sodium has a mass number of 23amu. Since sodium has 11 protons, the number of neutrons must be 23 – 11 = 12 neutrons.

Answer 2

c) 11 electrons and 12 neutrons...

Atomic number is no. of protons in an atom.... but protons is equal to no. of electrons in an atom so.... here atomic number is equal to the no. of electrons i.e. 11.... now the mass no. = atomic number+no. of neutrons

==> no. of neutrons = mass no. - atomic number => no. of neutrons = 23 - 11 = 12 neutrons....

So c) is correct...

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