An isotope of an element in (a) has atomic weight to units higher. what will be the number of protons, neutrons and electrons in this isotope.

Atomic weight, also called relative atomic mass, ratio of the average mass of a chemical element’s atoms to some standard. Since 1961 the standard unit of atomic mass has been one-twelfth the mass of an atom of the isotope carbon-12.An isotope is one of two or more species of atoms of the same chemical element that have different atomic mass numbers (protons + neutrons).

Explanation:

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Assuming that you have said that (a) has atomic weight TWO units higher

No of Protons same as that of the element

No of Electrons same as that of the element

No of neutrons will be = Number of element given + 2

Because,  ISOTOPES are the variants of a particular chemical element which differ in neutron number, and consequently in nucleon number. All isotopes of a given element have the same number of protons and electrons but different numbers of neutrons in each atom, which causes the differences in atomic weight.

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the formula mass of a molecule or a compound is the sum of the atomic weights of the atoms in its empirical formula

(that's what i know about formula mass)