Question

The notation for a particular nucleus is r3785b. in an electrically neutral atom. How many electrons are in orbit about this nucleus?

Answer 1

$^{85}_{37}Rb$ has 37 electrons in the orbit about its nucleus.

How to write an atomic symbol with atomic mass and atomic number?

Atomic mass is the total number of neutrons and protons present in the nucleus of an element.

The atomic number is the total number of protons present in the nucleus of an element.

For writing an atomic symbol, atomic mass is written on the top left of the atomic symbol, and the atomic number is written on the downside of the left of the symbol.

$^{Atomic mass}_{Atomic number}X$

An electrically neutral atom is an atom that has an equal number of electrons as well as protons.

Thus from the above conclusion we can say that  $^{85}_{37}Rb$ has 37 electrons.

Learn more about Atomic mass and atomic number here:

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