Question

define the term mass number of an atom if an atom B has mass number 35 and atomic number 17 state the number of protons electrons and neutrons it contains​

Answer 1

The atom contains 17 protons and 17 electrons as atomic number is the number of protons in an atom. The atom contains 18 neutrons as

no. of protons+no. of electrons=atomic mass.

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Answer 2

Step by step explanation-:

if an atom B has a mass number 35 and atomic number 17 then the number of proton and electron will also be equal to 17 as Z=P=e. and the number of neutron will be equal to 18 as mass number equal to number of protons + number of neutrons