Question

The atomic number of an element is 9 and the mass number is 18. What is the number of neutrons?​

Answer 1

Answer:

Please mark me as brainliest

Explanation:

Mass no.- No. of neutrons+ No. of Protons

Atomic No.- No. of protons

So, No. of Neutrons= Mass No.- Atomic No.

= 18-9

= 9

Answer 2

Answer:

number of neutrons is 9

Explanation:

atomic number = number of protons

mass number = number of protons + number of neutrons

therefore

number of neutrons = mass number - atomic number

=18-9

=9(answer)