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The number of protons defines the element. So if an atom has one proton, you will automatically know it is hydrogen. The number of neutrons or electrons will not change what element it is. Though if the question is asking, hydrogen with two protons is 3H, or tritium.

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14y ago
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15y ago

Helium is the element with two protons

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Tritium, a radioactive isotope of hydrogen.

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11y ago

The number of protons is the same as the atomic number, always. Number 2 on the Periodic Table is Helium which has 2 protons.

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Q: What element has one proton and two neutrons?
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An atom of hydrogen is made up of?

All isotopes of hydrogen contain one proton. The single thing that makes each element unique is the number of protons in its nucleus. Only that. Neutron count can vary with different isotopes of an element, and electron count can vary as we see an atom loan or borrow electrons. Proton count always identifies an element, and nothing else. The word "isotope" means the same element, with the same properties, but with different numbers of neutrons. Most hydrogen atoms have one proton and no neutrons. Deuterium is the isotope that has one proton and one neutron, and tritium has one proton and two neutrons.Hydrogen with oxygen forms water; deuterium and oxygen forms "heavy water". Tritium is radioactive, and decays into helium-3.


Can the number of neutrons for an element ever differ?

Absolutely. An element is defined by the number of protons in the atomic nucleus. For example, any nucleus with a single proton is by definition hydrogen. There are, however, three different forms of hydrogen; the kind with no neutrons (which is the most usual form), one neutron (known as deuterium) and two neutrons (known as tritium). Every element has isotopes with varying numbers of neutrons.


Why is proton number of an atom of an element different from the nucleon number of an atom of an element?

The difference between proton number (which is atomic number) and nucleon number, which is the number of protons and neutrons in an atom's nucleus, is the number of neutrons in the nucleus of a given nuclide. Nucleons are the components of an atomic nucleus. We know that both protons and neutrons make up an atom's nucleus. So the number of nucleons, which is the number of protons and neutrons, minus the number of protons, will equal the number of neutrons in the atomic nucleus.


What of an element are chemically identical but differ in the number of neutrons in the nucleus?

Elements which are chemically identical (have the same number of protons) but different numbers of neutrons are called isotopes.For example, the element H (hydrogen) has three naturally-occurring isotopes:- Protium or H-1, with one proton and no neutrons (the most common form)- Deuterium or H-2, with one proton and one neutron (quite rare)- Tritium or H-3, with one proton and two neutrons (extremely rare)Most elements have one distinctly common isotope. For example, the hydrogen in an ordinary glass of water is nearly 100% H-1, while the oxygen is nearly 100% O-16 (with 8 protons and 8 neutrons). Oxygen does occur naturally with 2 extra neutrons (O-18) and 1 extra neutron (O-17), but these isotopes are quite rare.


How do the isotopes hydrogen 1 and hydrogen 2 differ?

The basic difference is a neutron. Most hydrogen has a single proton for a nucleus. Hydrogen-2 has a neutron stuck to the proton, and hydrogen-3 has two neutrons stuck to the proton. Hydrogen-3 is a rare and highly unstable form of the first element.

Related questions

What element has 1 proton and 2 neutrons?

An element with 1 proton is hydrogen. An Isotope called Tritium has one Proton and two Neutrons. Hope this helps.


How man protons does an element have to have to make it radioactive?

One proton is in tritium, a radioactive isotope of hydrogen with two neutrons.


How does radioactive decay produce new elements?

In alpha decay, the nucleus loses two protons and two neutrons. The resulting element will therefore have an element number that is two less.In beta minus decay, a neutron gets converted to a proton. The resulting element will have one more proton - the element number will be one more. In beta plus decay, a proton gets converted to a neutron. The resulting element will have one less proton - the element number will be one less.


Why not He is the smallest element?

Helium is not the smallest element because it is made up of two protons, two neutrons and two electrons. Hydrogen is made up of one proton and one electron so it is smaller.


An isotope differs from regular atoms of an element by having a different number of?

Neutrons. As an example, hydrogen has three isotopes, Hydrogen, Duterium and Tritium. Hydrogen atoms consist of one proton and one electron. Duterium atoms consist of one proton, one electron and one neutron. Tritium atoms consist of one proton, one electron and two neutrons.


What is the metalloid element with the fewest number of protons?

If you look at the periodic table, the atomic number denotes the number of protons in the element. For example, the first element on the table is hydrogen, and it has one proton (the fewest). Element number two is helium, and it has two protons, etc.


How many neutrons protons and electrons are in each tritium?

Tritium (Hydrogen-3, H3, T) has 1 Proton, 2 Neutrons, and 1 Electron.


An atom of hydrogen is made up of?

All isotopes of hydrogen contain one proton. The single thing that makes each element unique is the number of protons in its nucleus. Only that. Neutron count can vary with different isotopes of an element, and electron count can vary as we see an atom loan or borrow electrons. Proton count always identifies an element, and nothing else. The word "isotope" means the same element, with the same properties, but with different numbers of neutrons. Most hydrogen atoms have one proton and no neutrons. Deuterium is the isotope that has one proton and one neutron, and tritium has one proton and two neutrons.Hydrogen with oxygen forms water; deuterium and oxygen forms "heavy water". Tritium is radioactive, and decays into helium-3.


Is only one kind of atom in a element?

Yes and no. All elements are composed of the same basic "stuff"--- protons, neutrons and electrons. But when the number of protons, neutrons and electrons change, a completely different element appears. A given element will always have the same number of protons but can have several numbers of neutrons. Substances with identical numbers of protons but different numbers of neutrons are called isotopes. Take for example hydrogen. One proton bound in an atom with no neutrons is what we know as protium, the most abundant isotope of hydrogen. One proton bound in an atom with one neutron is called deuterium while one proton bound in an atom with two neutrons is called tritium. These are all isotopes of hydrogen because they contain only one proton, but differ in the their number of neutrons.


Difference between deuterium and tritium?

Deuterium is an isotope of hydrogen that has 1 neutron (an ordinary hydrogen atom has none). A nucleus of tritium has 2 neutrons.


How can you use the word neutrons in a sentence?

Hydrogen has one proton, and one electron. However deuterium is hydrogen with one neutrons. Tritium has one proton and two neutrons.


Why are protons and neutrons used in the subatomic particle?

Protons and neutrons provide the mass of an atom. Each different kind of element has a unique number of protons. For example: all hydrogen atoms have one proton. However, not all hydrogen atoms have the same mass. Some hydrogen atoms have no neutrons, one neutron, or two neutrons. Atoms of the same element (one proton) but different numbers of neutrons (different masses) are called isotopes of that element. All elements have isotopes. Some isotopes of elements are radioactive and are useful in medicine and energy applications (nuclear, for instance).