Question

An element B contains 18 electrons and 18 neutrons. Calculate mass number and
identify B.​

Answer 1

Answer:

mass is 36 and element is Argon

Explanation:

if no. of electrons is 18, no. of protons is also 18.

then... mass is no. of protons + no. of neutrons => 18 + 18 = 36 amu

Atomic number 18 is Argon...

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