What causes hydrogen gas to glow when an electric current is passed through it?
Terms in this set (62) What gives gas-filled lights their colors? An electric current passing through the gas in each glass tube makes the gas glow with its own characteristic color. These electrons lose energy by emitting light when they return to lower energy levels.
Which gases emit colors when an electric current is applied?
Argon and Krypton are noble gases because their outermost shell is fully filled. They emit colors when an electric current is applied because when current passes through it then electron are excited by absorbing energy and they jump from ground state to higher energy level.
What color does xenon glow?
blue glow
What color does hydrogen gas glow when excited?
Color
| Gas | Color | Notes |
|---|---|---|
| Oxygen | Violet to lavender, dimmer than argon | |
| Hydrogen | Lavender at low currents, pink to magenta over 10 mA | |
| Water vapor | Similar to hydrogen, dimmer | |
| Carbon dioxide | Blue-white to pink, in lower currents brighter than xenon | Used in carbon dioxide lasers. |
Which element in Group 7a is the most reactive?
Fluorine
What is the name of Group 7A?
Group 7A — The Halogens. Group 7A (or VIIA) of the periodic table are the halogens: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At). The name “halogen” means “salt former”, derived from the Greek words halo- (“salt”) and -gen (“formation”).
Why is Group 7A reactive?
Having seven valence electrons makes the halogens extremely reactive. Atoms are stable when they have eight valence electrons, so the halogens really want another element’s electrons to make eight.
What is the most reactive in Group 1?
francium
Which element is most reactive with water in Group 1?
Problems
- Metal oxides form basic solutions in water.
- Difluorine does not react with water.
- Beryllium has a large atomic radius.
- Sodium is the alkali element that reacts most violently with water.
Why is lithium most reactive?
Reactivity. Lithium is part of the Group 1 Alkali Metals, which are highly reactive and are never found in their pure form in nature. This is due to their electron configuration, in that they have a single valence electron (Figure 1) which is very easily given up in order to create bonds and form compounds.
Why Is Lithium the least reactive in Group 1?
Lithium is the least reactive because it is the one with the least electrons. AS you go down the elements in group 1 the electrons are able to react more violently with water because less energy is needed for the electron to leave the metal.
What gas is given off when lithium reacts with water?
hydrogen
Is Lithium the most reactive metal in Group 1?
Reactivity of Group 1 Elements Hydrogen is a very reactive gas, and the alkali metals are even more reactive. The reactivity of alkali metals increases from the top to the bottom of the group, so lithium (Li) is the least reactive alkali metal and francium (Fr) is the most reactive.
Is potassium more reactive than lithium?
Potassium metal is indeed more reactive than lithium metal, because potassium has a more loosely bound valence electron. In direct reactions, potassium reacts more violently than lithium.
Why is potassium a better electrical conductor than lithium?
Since they are metals so they loose electrons. The tendency to loose electrons is greater in potassium than that in lithium. This is because in lithium the valence electrons are closer to the nucleus therefore the attractive forces between nucleus and valence electrons are very strong.
Who is more reactive Li or K?
In a reactivity series, the most reactive element is placed at the top and the least reactive element at the bottom. More reactive metals have a greater tendency to lose electrons and form positive ions ….The reactivity series.
| Element | Reaction with water |
|---|---|
| Potassium | Violently |
| Sodium | Very quickly |
| Lithium | Quickly |
| Calcium | More slowly |