Your question makes no sense.
Depending on the temperature, hydrogen can exist in three states of matter (forms), viz., gas, liquid, and solid. Also hydrogen has three isotopes, viz. protium, deuterium, and tritium. This depends on the number of neutrons present in the nucleus. protium ; 0 neutrons ; The most common isotope of hydrogen deuterium ; 1 neutron ; known as 'heavy hydrogen'. tritium ; 2 neutrons ; known as 'super-heavy' hydrogen, and it is also radio-active. NB When describing as 'forms' you need to be more specific, re. isotopes, states of matter , or any other characteristic.
Hydrogen, Deuterium, Tritium
Hydrogen atom have three isotope which is hydrogen , deuterium , and tritium.
Hydrogen has three isotopes: Protium, deuterium and tritium. All have one proton, one electron and they have 0, 1 and 2 neutrons respectively.
deuterium
Hydrogen-2 is commonly referred to as deuterium, in addition to that it is known as Deuterium-1
The three isotopes of hydrogen are called: hydrogen (1H or H, no neutrons), deuterium (2H or D, one neutron), and tritium (3H or T, two neutrons).They each have their own special name to make it easier to refer to them. They are fairly commonly used in chemistry and physics (especially deuterium).
Hydrogen exists in three isotopic forms: 1. Hydrogen 2. Deuterium 3. Tritium Hydrogen atom contains one proton, one electron and no neutron. Deuterium atom contains one proton, one electron and one neutron. Tritium atom contains one proton, one electron and two neutrons.
There are three isotopes of hydrogen, hydrogen-1, also called protium; hydrogen-2, also called deuterium; and hydrogen-3, also called tritium.
Deuterium, also known as heavy hydrogen, exhibits three separate properties: Physical properties, quantum properties and nuclear properties (the deuteron).
Deuterium is just an isotope of hydrogen, so the atomic number is 1.
Deuterium is hydrogen. The difference between deuterium and protium (the regular hydrogen) is that deuterium has an extra neutron. As a result, there are some differences in physical properties such as density, boiling point, etc.