The isotopes of hydrogen are
(a) deuterium and tritium only
(b) protium and deuterium only
(c) proti

Q: Are all isotopes of hydrogen radioactive?

No, only Tritium is radioactive. Protium and Deuterium are completely stable.

Q: Do these isotopes have different chemical properties?

Chemically, they are almost identical because they have the exact same number of electrons. However, their reaction rates can differ slightly due to the kinetic isotope effect caused by their mass differences.

Q: What exactly is heavy water?

Heavy water is $D_2O$, where the normal hydrogen atoms are replaced by deuterium. It's physically heavier and denser than normal water.

Q: Why is Tritium radioactive while the others are not?

The ratio of neutrons to protons in Tritium is 2:1. This high ratio makes the nucleus unstable, leading to radioactive decay to achieve a more stable state.

Q: Which isotope is the most abundant in nature?

Protium is by far the most abundant, making up over 99.98% of all naturally occurring hydrogen on Earth.

Question

The isotopes of hydrogen are

Options:

(A) deuterium and tritium only

(B) protium and deuterium only

(C) protium, deuterium and tritium

(D) tritium and protium only

Sigma Percentile · Accepted Answer

The universe is built on hydrogen, the simplest and most abundant element. But did you know that not all hydrogen atoms are exactly the same? Just like people have siblings, elements have isotopes!

### What Are Isotopes?
Isotopes are atoms of the same element that share the same atomic number (number of protons) but have different mass numbers (number of protons plus neutrons). Because they have the same number of electrons, their chemical properties are nearly identical. However, their physical properties, like mass and density, can differ significantly.

### The Three Siblings of Hydrogen
Hydrogen is unique because its isotopes are the only ones in the entire periodic table that have been given distinct names. Let's meet the family:

**1. Protium ($^1	ext{H}$)**
This is the most common form of hydrogen, making up over $99.98\%$ of all hydrogen in the universe. Its nucleus is incredibly simple—just a single proton. There are no neutrons at all! A single electron orbits this nucleus.

**2. Deuterium ($^2	ext{H}$ or $	ext{D}$)**
Also known as "heavy hydrogen," deuterium has one proton and one neutron in its nucleus. This extra neutron doubles its atomic mass compared to protium. Deuterium is famous for its role in making "heavy water" ($D_2O$), which is used as a moderator in nuclear reactors to slow down fast-moving neutrons.

**3. Tritium ($^3	ext{H}$ or $	ext{T}$)**
The heaviest and rarest sibling is tritium. Its nucleus contains one proton and two neutrons, giving it a mass number of $3$. Because this nucleus is so heavy and packed, it becomes unstable. As a result, tritium is radioactive and slowly decays by emitting low-energy $\beta^-$ particles.

### The Final Verdict
Returning to our question, it asks for the isotopes of hydrogen. As we've just explored, hydrogen exists in three isotopic forms: **protium, deuterium, and tritium**. Therefore, the correct option is the one that lists all three.

Understanding these isotopes isn't just about memorizing names; it's about appreciating the subtle variations in the building blocks of our universe!

Animated Solution for Chemistry - s and p-Block Elements: The isotopes of hydrogen are

Select Answer:

Visualized Solution

$I so t o p es o f H y d r o g e n$

$P r o t i u m (^{1} H)$

$D e u t er i u m (^{2} H or D)$

$T r i t i u m (^{3} H or T)$

$C o n c l u s i o n$

$B ey o n d t h e B a s i cs$

The Sigma Insight: Hydrogen, Hydrides and Water

What Are Isotopes? Isotopes are atoms of the same element that share the same atomic number (number of protons) but have different mass numbers (number of protons plus neutrons)

The Three Siblings of Hydrogen Hydrogen is unique because its isotopes are the only ones in the entire periodic table that have been given distinct names

The Final Verdict Returning to our question, it asks for the isotopes of hydrogen

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