An atom has an atomic number 9 and a mass number 19. The number of neutron present in their nucleus are _____?
ایک ایٹم میں ایٹم نمبر 9 اور بڑے پیمانے پر نمبر 19 ہوتا ہے۔ ان کے نیوکلئس میں موجود نیوٹران کی تعداد _____ ہے؟
Answer: 10
Explanation
Number of neutrons = Mass number − Atomic number = 19 − 9 = 10
Atomic number (9) is the number of protons; mass number (19) is protons + neutrons.
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