The atomic bomb was a pure fission device, utilsing compression of a sub-critical uranium (Little Boy) (or plutonium: the Fat Man nuclear weapon) to cause an explosion.
The H-bomb is a 'hybrid' device utilising a 'primary' charge that is effectivly an atomic bomb but a 'secondary' charge is also used, a container of hydrogen (deuterium and/or tritium) which undergoes fusion due to the heat/pressure/neutrons released by the primary.
Atom: pure fission
H-bomb: fission/fusion hybrid
The difference between a hydrogen atom and atomic hydrogen is that the "hydrogen atom" represents one atom of the chemical element hydrogen. Atomic hydrogen are isolated hydrogen atoms.
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A hydrogen atom is made from 1 hydrogen atom while a hydrogen molecule is made by 2 hydrogen atoms in a chemical compound thus making it twice as big too.
Electronegativity of hydrogen is 2,20. Electronegativity of sodium is 0,93.
There are many differences between a hydrogen atom and a carbon atom. Most importantly, the number of protons and electrons within the atom. This is what gives atom's their characteristics. Hydrogen is a gas at room temperature, while carbon is a solid at room temperature.
A hydrogen atom is only a proton and an electron. Beyond that the neutron seems to keep the nucleus together and stable. Maybe a better question is, "What is the difference between a hydrogen atom without an electron and a proton?"
Since heavy water contains an isotope of hydrogen 2H or more commonly called Deuterium means that the hydrogen atom in heavy water will have an extra neutron in the nucleus.
A hydrogen atom carries a neutral charge. (The number of protons and electrons are balanced.)A hydrogen cation is an ion so it carries a charge, and it's a positive charge because it's a cation. (There is one less electron, which makes the element a cation.)
The covalent bond between a hydrogen atom and and an oxygen atom when the two atoms share electrons. They form a water molecule when there are two hydrogen atoms sharing electrons with one oxygen atom.
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Hydroxide is OH- it is a negative ion consisting of a hydrogen atom and an oxygen atom covalently bound together. The hydrogen ion is H+ indicating a single hydrogen atom with a positive charge. However, it rarely exists on its own. In an aqueous solution it bonds with a water molecule to form the hydronium ion, H3O+
Water is composed of Two Hydrogen atoms that form a polar covalent bond with an oxygen atom.