Question

Element Q, Atomic number=7, Mass number =14. What is the number of protons, neurons, electrons, and Electronic configuration?

Answer 1

Answer on Question #82818 – Chemistry – Other

Task:

Element Q, Atomic number = 7, Mass number = 14. What is the number of protons, neutrons, electrons, and electronic configuration?

Solution:

Number of protons = atomic number Z

Number of neutrons = mass number - atomic number = A–Z

The atomic number is the number of protons in an atom’s nucleus, so we can tell right away that an atom of Q contains 7 protons.

The mass number (14) is the total number of protons and neutrons.

So, there must be $14 - 7 = 7$ neutrons.

Since atoms are electrically neutral, there must be as many electrons as there are protons.

A Q atom needs 7 electrons to balance the 7 protons.

Electronic configuration: $1s^{2}2s^{2}2p^{3}$

Element $Q = N$ (nitrogen).

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