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This is called also protium and contain 1 proton and 1 electron.

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Q: A hydrogen atom that has mass number of 1?
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Is the mass number of an atom equal to the atomic number?

Only if the atom is hydrogen-1! The mass number of the atom is equal to the sum of the numbers of protons, which is the same as the atomic number, plus the number of neutrons. The only non-radioactive atom without neutrons is hydrogen-1.


Is the mass of a hydrogen atom different from the mass of an oxygen atom?

all atoms have different masses Mass of an atom is due to protons and neutrons present in an atom and number of proton is something that distinguish between atoms, therefore mass of hydrogen is different to the mass number of oxygen, hydrogen's mass is 1 as it has only 1 proton and no neutrons, and oxygen mass's is 16 as it has 8 protons and 8 neutrons.


What is the mass ratio from a hydrogen atom to ununoctium atom?

Mass of hydrogen atom = 1 amu Mass of ununoctium atom = 294 amu So ratio = 1 : 294


What is the atomic number and mass number of deuterium 2H?

As Deuterium and Tritium are both merely isotopes of Hydrogen and not elements in their own right, they both have an atomic number of 1, just like Hydrogen (Hydrogen-1). Deuterium (Hydrogen-2) has an atomic mass of 2, and Tritium (Hydrogen-3) has an atomic mass of 3.


The mass number of an atom can be equal to the atomic number.?

Yes but only if there are no neutrons, such as in hydrogen (atomic number=1, relative Atomic Mass-1)


How many neutrons are in an atom of deuterium?

Deuteriums emision spectrum either is like hydrogen http://chemed.chem.purdue.edu/genchem/topicreview/bp/ch6/bohr.html or like http://en.wikipedia.org/wiki/Image:Deuterium_lamp_1.png


How can there be 1 proton with a hydrogen atom with a mass?

Protons and electrons both have mass. Therefore a hydrogen atom that contains one or both will have mass. (It will, however, be less massive than a hydrogen atom that also has neutrons.)


What are the sizes of a hydrogen atom carbon atom and oxygen atom?

H has a mass number of 1 (one proton, no neutrons), Carbon has a mass number of 12 (6 neutrons, 6 protons) and O has a mass number of 16 (8 neutrons and 8 protons).


What is the atomic number the atomic mass and the number of neutrons of the element hydrogen?

The 'standard' hydrogen atom has atomic number 1, atomic mass 1, no neutrons. Although there are 2 other isotopes of hydrogen: - (cant confirm name) which has atomic mass 2 and 1 neutron. - (cant confirm name) has atomic mass of 3 and 1 neutron. All isotopes have atomic number 1.


What atom has an atomic number of 1?

Hydrogen Hydrogen Hydrogen Hydrogen


How is mass number and atomic number the same?

They are not. Atomic number is the total number of protons in an atom. Mass number is the total number of protons and neutrons. The only isitope in which they are the same is Hydrogen-1 with 1 proton and no neutrons.


A molecule of water is composed of two atoms of hydrogen and one atom of oxygen if the atomic mass number of hydrogen is 1 and the molecular mass of water is 18 the atomic mass of oxygen must be?

16