The noble gas notation for lead is [Xe] 4f14 5d10 6s2 6p2. Lead has 82 electrons, and the noble gas before it is xenon, which has 54 electrons.

Sodium's noble gas configuration is [Ne]3s1, which means it has the same electron configuration as neon up to the 3s orbital, and then has one additional electron in the 3s orbital.

Helium has 2 electrons in its outer shell. Helium's electron configuration is 1s^2, meaning it has a full outer shell with two electrons.

Inert gases have 8 valence electrons. This is why they are inert, they have a complete octet formed of electrons and are in their lowest energy configuration.

Helium... that's what i found in chemicalelements.com ... but on my science homework (Crossword) it doesnt fit because of the L in Chlorine. :/

Helium is a noble gas with 2 electrons.

(Respond to earlier message:)

I have the same science homework, and if it still helps, 18 down is Fluorine, not Chlorine. And 20 across is Helium.

Noble gases have a full outer electron shell, making them stable and unreactive. Their electron configuration does not allow them to easily gain or lose electrons, resulting in an oxidation state of zero. They rarely form compounds with other elements due to their stable electron configuration.

Helium isn't usually sold by the gram, but by volume. Typical prices for a, say, 15 cubic foot container (that's 15 cubic feet at STP; the container itself is significantly smaller) would be around $50.

A cubic foot is about 28.3 L, so that's about $0.12 per liter. A mole of ideal gas at STP is 22.4 L, and a mole of helium would have a mass of 1 gram, so, roughly $2.70 per gram is about right.

As with most things, you can get a much better price if you buy in bulk.

Helium is the second most abundant element in the universe, after hydrogen. It is the only element that was discovered first in space before being found on Earth. Helium has the lowest boiling point of all the elements and is commonly used in cryogenics and as a coolant in various applications.

Helium is an element. It is a noble gas with the atomic number 2 and is the second lightest and second most abundant element in the universe.

The number of neutrons in an atom can be found by subtracting the number of protons (which is the atomic number) from the mass number. The mass number is the sum of protons and neutrons in the nucleus of an atom.

Helium has an atomic number of 2, indicating that it has 2 protons in its nucleus.

Helium in the early Universe primarily formed during the process of Big Bang nucleosynthesis. This occurred within the first few minutes after the Big Bang, when protons and neutrons combined to form helium nuclei in a process known as nucleosynthesis. About 25% of the mass of the Universe is estimated to consist of helium-4, which was produced during this early period.

Helium is a chemical element with the symbol He and atomic number 2. It is a colorless, odorless, tasteless noble gas. In its natural form, helium is a monatomic gas composed of individual helium atoms.

Yes, helium is lighter than air. Helium is a lighter-than-air gas that has a lower density compared to the gases that make up our atmosphere, such as nitrogen and oxygen. This is why helium-filled balloons float in the air.

If a helium balloon explodes, the helium gas inside will rapidly escape into the surrounding environment. The sound of the explosion may startle people nearby but there are no health hazards associated with inhaling helium released from a burst balloon. The latex or plastic remnants of the balloon will need to be cleaned up.

The elements arranged by electron affinity from most positive to most negative value are cesium, helium, tellurium, bismuth, and chlorine. This order is based on the tendency of each element to gain an electron and form a negative ion.

Helium is commonly used to inflate balloons because it is lighter than air, allowing the balloon to float. Some balloons may also be filled with air, especially if they are small or decorative balloons.

The elements in Group 18 of the periodic table are known as noble gases. These elements have full outer electron shells, making them stable and less likely to form chemical bonds with other elements. Some examples of noble gases include helium, neon, and argon.

Lithium has a higher melting point than helium. Lithium melts at around 180.5 degrees Celsius, whereas helium melts at a much lower temperature of -272.2 degrees Celsius.

Noble gases are important because they are chemically inert, which makes them useful in a variety of applications. For example, helium is essential for cooling superconducting magnets in MRI machines, neon is used in neon signs for lighting, and argon is used in welding to protect the weld from reacting with oxygen in the air. Noble gases also have uses in lighting, electronics, and even as carriers for sensitive materials in gas chromatography.

There is no known substance or element called "hulium." It may be a misspelling or misunderstanding of a different substance. If you are referring to a different element or compound, please provide more information for a more accurate answer.

inert gas.

Helium has 2 protons, 2 electrons, and 2 neutrons.

A 135 lb helium tank can fill approximately 100-150 standard 18-inch mylar balloons, depending on the size of the balloons and the amount of helium needed to inflate each one. It's always best to check with the manufacturer or vendor for specific guidelines.

The three lightest noble gases are helium, neon, and argon.