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Which two elements have an atomic mass less than twice their atomic number?
Elemental hydrogen and helium have atomic masses less than twice their atomic numbers.
How many protons and neutrons are in the nucleus of a helium-4 atom if it has twice as many protons as a hydrogen atom?
A hydrogen atom has 1 proton in its nucleus. Since the helium-4 atom has twice as many protons as hydrogen, it has 2 protons. Helium-4 also has 2 neutrons, hence the name "4" representing the total number of protons and neutrons.
Compare the rate of effusion of hydrogen and helium?
The rate of effusion of helium is higher than hydrogen because helium has a lower molar mass. The rate of effusion is inversely proportional to the square root of the molar mass, meaning lighter gases effuse faster. Helium, being lighter than hydrogen, effuses faster.
What is Jupiter's planet?
Jupiter is mostly made of molecular hydrogen and helium its structure is hard and bold but Jupiter has twice of powerful storms than earth.....
Is helium a meson?
twice
Why is a sample of helium is more dense than a sample of hydrogen under the same conditions?
Avagadro's hypothesis was that at a constant pressure and temperature, the number of molecules of two gases at equal volumes will be the same. This is true in that there is always one mole of gas per 22.4 liters no matter what the gas is. However, each gas has a different molarity, or grams per mole. This means that although each gas will have one mole in 22.4 liters, they will have different weights. For example, hydrogen contains 2.02 grams per mole, while helium contains 4 grams per mole. Therefore, at a constant pressure and temperature hydrogen and helium have different weights at the same constant volume.
What planet is Jupiter on?
Jupiter is mostly made of molecular hydrogen and helium its structure is hard and bold but Jupiter has twice of powerful storms than earth.....
What is the second lightest gas?
The second lightest gas is helium. The lightest gas is hydrogen which is also the lightest element. They are very close on the Periodic Table.
Why is it wrong to say that 50c helium is twice as hot as 25c helium?
Temperature measures the average kinetic energy of particles in a substance, not its concentration or quantity. Saying that 50°C helium is twice as hot as 25°C helium is incorrect because temperature is not a quantity that can be doubled or halved in that manner.
What is released when hydrogen nuclei fuse into helium nuclei?
Because in the sun, nuclear fusion (or thermonuclear reaction) is happening, means an atom core is joined with other's atom core, making it a bigger atom and more unstable. In the sun and other stars, one hydrogen atom is joined itself with the other hydrogen atom and reacting, releasing particles, positron, neutrino and energy. The result is 2H. Then it joined itself with another 1H atom. Then the fusion reaction happens. It's repeating until the third reaction, where 3He is joining with other 3He, releasing two 1H and a 4He. In short, one Hydrogen atom join another one Hydrogen Atom and result two hydrogen atoms, Neutrino, and Positron (1H + 1H = 2H, Positron, Neutrino). This process is repeating twice (although the second time, 2H is joining 1H = 2H + 1H = 3He). Then, the Third time, where the Hydrogen atoms become Helium atoms, they join together and releasing two 1 H and 4He atoms (3He + 3He = 2x 1H, 4He). ( The fusion also the one who detonate the Hydrogen Bomb). Source: Wikipedia (see related links)
The angle of rotation is the measure of the angle formed by the lines?
the answer is twice. the angle of rotation is twice the measure
What do you need to make h20?
twice as much hydrogen to oxygen
