Question

the number of isotopes of gold is ? a) 3. b) 1. c) 2. d)4​

Answer 1

Gold has 1 stable isotope.

So, option B is correct


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Answer 2

Answer:

We know that gold is a metal whose atomic number is 79.

It is a naturally occurring element.

Its reactivity is very less.

Chemically gold is represented by the symbol ‘Au’.

In the reactivity series of metals, the gold is placed at the bottom of the table which means, its reactivity is very less.

Explanation:

Let’s understand isotopes in detail. Isotopes are atoms of the same element which have the same atomic number and their mass number is different.

Let’s understand isotopes with the help of an example. Hydrogen has three isotopes, Protium, deuterium and tritium.

All of them have atomic number 1 but the mass number of Protium is 1, the mass number of deuterium is 2 and the mass number of tritium is 3.

Let’s discuss the isotopes of gold.

Gold (Au79) has a stable isotope, 197Au and 36 radioisotopes.

Among the radioisotopes, Au-195 is the most stable one whose half-life is 186 days.

So, the correct answer is Option A) 3.

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