What are the properties of alkali metals halogens and noble gases?
The alkali metals are extremely reactive, low melting metals, exploding in water, but the alkali ions in the high-melting product are stable and harmless. The halogens are toxic, colored, reactive gases, but react with alkali metals to give innocuous ions in white compounds.
What are the properties of alkali metals on the periodic table?
The alkali metals are a group of chemical elements in the periodic table with the following physical and chemical properties:
- shiny.
- soft.
- silvery.
- highly reactive at standard temperature and pressure.
- readily lose their outermost electron to form cations with a charge of +1.
What are the properties of the groups on the periodic table?
Characteristics of groups and periods in a periodic table
- Atomic Size: From top to bottom in a group, the size of atom increases as a new shell to the atom.
- Valence Electrons(V.E) : Number of valence electrons in a group are same.
- Valency: All elements in a group generally have the same valency.
What are the halogens properties?
Halogens share many similar properties including:
- They all form acids when combined with hydrogen.
- They are all fairly toxic.
- They readily combine with metals to form salts.
- They have seven valence electrons in their outer shell.
- They are highly reactive and electronegative.
What are the properties of noble gasses?
Other characteristics of the noble gases are that they all conduct electricity, fluoresce, are odorless and colorless, and are used in many conditions when a stable element is needed to maintain a safe and constant environment. This chemical series contains helium, neon, argon, krypton, xenon, and radon.
What is the major difference between halogens and noble gases?
Here’s what I mean: Halogens are extremely reactive elements because they need one more electron to gain a full octet of valence electrons, whereas the noble gases are extremely unstable because they already have their full octet.
What are the properties of halogens?
Group 17: Physical Properties of the Halogens
| Property | F | Cl |
|---|---|---|
| Density of liquids at various temperatures, /kg m-3 | 1.51 (85 °K) | 1.66 (203 °K) |
| Melting point, /K | 53.53 | 171.6 |
| Boiling point, /K | 85.01 | 239.18 |
| Enthalpy of atomization, ΔaH° (298K) / kJ mol-1 | 79.08 | 121.8 |
Why are noble gases called noble gases?
The science. The noble gases, in order of their density, are helium, neon, argon, krypton, xenon and radon. They are called noble gases because they are so majestic that, in general, they don’t react with anything. For this reason they are also known as inert gases.
Where are noble gases on periodic table?
The six noble gases are found in the far right column of the periodic table. Helium’s (He) name originates from the Greek helios, meaning sun; neon (Ne) from the Greek neos, meaning new. Argon (Ar) derives from the Greek argon, meaning inactive; krypton (Kr) from the Greek kryptos, meaning hidden.
How are halogens and noble gases similar and different?
Explanation: Halogens are very reactive because they have seven valence electrons and need one more to have eight valence electrons (an octet). The noble gases have filled valence shells as they occur in nature. Helium has a duet of valence electrons, and the rest of the noble gases have an octet.
What are the properties of the alkali metals?
Alkali Metals. The metals in Group I of the periodic table are called the alkali metals. They are: Properties of alkali metals: The alkali metals have the high thermal and electrical conductivity, lustrous, ductile, and malleable that are characteristic of metals. The alkali metals are softer than most other metals.
What are the properties of the halogens group?
The halogens exhibit different physical properties from each other but do share chemical properties. extremely high electronegativity. very reactive. seven valence electrons, so elements from this group typically exhibit a -1 oxidation state.
What happens when alkali metals react with halogens?
When alkali metals react with halogens, halides are formed. All the halides readily dissolve in water except lithium fluoride (LiF). All the halides are ionic in nature except lithium iodide. When alkali metals react with nitogen, nitrides are formed.
Where are the alkali metals located on the periodic table?
Alkali metals group is located on the maximum left side of the modern periodic table. It is the first group of s-block, Despite the presence of hydrogen at the top of the group (1A), It is not one of the alkali metals but it is one of the nonmetals because it has a small atomic size and it is a gas.