3 years ago

The atomic number of this element is 9 and its mass is 20. how many neutrons does this element have?

Chemistry

2 answers:

devlian [24]3 years ago

8 0

Answer:

11 neutrons

Explanation:

Mass no. = 20

atomic no. = 9

no. of neutrons = mass number - atomic number

= 20 - 9

= 11 neutrons

Marta_Voda [28]3 years ago

3 0

Hey there!

n = A - Z

n = 20 - 9

n = 11

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