The number of electrons and neutrons of an element is $18$ and $20$ respectively. its mass number is :

2

No worries! We‘ve got your back. Try BYJU‘S free classes today!

17

No worries! We‘ve got your back. Try BYJU‘S free classes today!

37

No worries! We‘ve got your back. Try BYJU‘S free classes today!

38

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

Open in App

Solution

The correct option is D $38$
The mass number = atomic number + number of neutrons
Atomic number = No. of proton = No. of electron (for an atom)
So, mass number $= 18 + 20 = 38$

Suggest Corrections

Similar questions

17

37

17

If an atom of an element contains 17 electrons and 18 neutrons, find the number of protons, atomic number and mass number of the element.

An ion $X^{2 +}$ contains 18 electrons and 20 neutrons. Calculate the atomic number and mass no. of element X. Name the element X.

An ion X²⁺ contains 18 electrons and 20 neutrons. Calculate the atomic number and mass no. of element X. Name the element X.

Join BYJU'S Learning Program