Match the correct pair -- the isotope written as mass number 80, atomic number 35 (Bromine-80, ^80_35Br) should be matched with the correct item from Column B:

(a) 45 Neutron
(b) Octahedral
(c) mol L^-1
(d) ΔS = q(rev)/T
(e) (triangle symbol, drawn as a downward-pointing triangl

Question

Match the correct pair -- the isotope written as mass number 80, atomic number 35 (Bromine-80, ^80_35Br) should be matched with the correct item from Column B:

(a) 45 Neutron
(b) Octahedral
(c) mol L^-1
(d) ΔS = q(rev)/T
(e) (triangle symbol, drawn as a downward-pointing triangle -- representing a 3-membered ring shape)

Accepted Answer

>

> [!TLDR]
> Number of neutrons = mass number (A) - atomic number (Z). For A = 80, Z = 35 (Bromine-80): neutrons = 80 - 35 = 45, matching option (a).
> …

Notation	Element	Protons ( $Z$ )	Neutrons ( $N$ )	Mass Number ( $A$ )
$^{1}_{1}\text{H}$	Hydrogen	1	0	1
$^{4}_{2}\text{He}$	Helium	2	2	4
$^{23}_{11}\text{Na}$	Sodium	11	12	23

Q.Match the correct pair -- the isotope written as mass number 80, atomic number 35 (Bromine-80, ^80_35Br) should be matched with the correct item from Column B:

Concept understanding — Atomic Notation

Atomic Notation: The ID Card of an Atom

The Intuition: Three Numbers, One Symbol

The Precise Statement

Example: Carbon-12

Why Two Numbers? Why Not Just One?

A Quick Table for Clarity

Q.Match the correct pair -- the isotope written as mass number 80, atomic number 35 (Bromine-80, ^80_35Br) should be matched with the correct item from Column B:

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