Question

the nucleus of an atom has 5 protons and 6 neutrons (a) what would be the atomic number (b) mass number(c) the number of electrons and (d) the number of valence electrons per atom of this element​

Answer 1

Answer:

Given:

Number of protons = 5

Number of Neutrons = 6

To find:

Atomic number =?

Mass number = ?

Electronic configuration = ?

Formula to be used:

Mass number = No. of protons + No. of neutrons

Calculation:

Atomic number :

→ The number of protons is equal to the atomic number of the element.

→:As the nucleus of atoms is composed of 5 protons, the atomic number of the element is identified as 5.

Mass number :

→ To calculate the mass number of the element, the following formula must be used:

→Mass number = No. of protons + No. of neutrons = 5+6= 11

→Thus the mass number of the element is identified as 11.

Electronic configuration :

→ The electronic configuration is written based upon the atomic number of the element.

→As the atomic number of the element is identified as 5, its electronic configuration will be 1s^22s^22p^1.