0
The "expected" answer is helium, neon, and argon, BUT
-- in 2000 there was a claim that the first argon compound had been made
-- no compounds of elements 99 and above are really "known", since most of these elements last less than an hour, and have never been made in quantities of more than a few atoms at a time. We "know" of many compounds that must exist, and have a very good sense of what their properties are, but compounds have not actually been prepared and characterized.
-- it is very doubtful that any francium compound has been isolated and characterized, although those of the other very unstable lighter elements promethium, astatine, actinium, and protactinium have been.
What else can I help you with?
What is the oxidation number of group 3 elements?
Group 3 elements typically have an oxidation state of +3. This is because they have 3 valence electrons that they can lose to form stable compounds.
Which group on the periodic table are known as transition metals?
Transition metals are found in groups 3 to 12 on the periodic table. They are known for their variable oxidation states and ability to form colorful compounds. These elements often exhibit metallic properties such as conductivity and malleability.
What are common compounds for helium?
Common compounds for helium include helium-3 (He-3) and helium-4 (He-4), which are isotopes of helium. Helium is typically chemically inert and does not readily form compounds with other elements under normal conditions.
Which group generally loses 3 valence electrons and are almost always combined with other elements in nature?
Group 13 elements, such as Boron and Aluminum, generally lose 3 valence electrons and form compounds with other elements in nature. They are commonly found in minerals and ores in combination with other elements, due to their tendency to form stable compounds through electron loss.
What name is give to groups 3-12 in periodic table?
Groups 3-12 in the periodic table are called the transition metals. They are located in the middle of the periodic table and are known for their malleability, ductility, and ability to form colorful compounds.
What is the oxidation number of group 3 elements?
Group 3 elements typically have an oxidation state of +3. This is because they have 3 valence electrons that they can lose to form stable compounds.
Which group on the periodic table are known as transition metals?
Transition metals are found in groups 3 to 12 on the periodic table. They are known for their variable oxidation states and ability to form colorful compounds. These elements often exhibit metallic properties such as conductivity and malleability.
Are compounds and elements a mixture?
No. Elements, compounds and mixtures are 3 different terms.
What are common compounds for helium?
Common compounds for helium include helium-3 (He-3) and helium-4 (He-4), which are isotopes of helium. Helium is typically chemically inert and does not readily form compounds with other elements under normal conditions.
Which group generally loses 3 valence electrons and are almost always combined with other elements in nature?
Group 13 elements, such as Boron and Aluminum, generally lose 3 valence electrons and form compounds with other elements in nature. They are commonly found in minerals and ores in combination with other elements, due to their tendency to form stable compounds through electron loss.
Is group fifteen an ionic compound on the periodic table?
Group 15 elements generally form covalent compounds. However the two elements from group 15 nitrogen and phosphorus are known to form nitride (N3-) and phosphide (P3-) ions as in Na3N or Na3P.
What are groups 3-12 collectively known as?
Groups 3-12 are collectively known as the transition metals. They are characterized by their ability to form colorful compounds and exhibit variable oxidation states. These elements are often used in various industrial applications due to their unique properties.
What are the valencies of phosphate?
Phosphate has a valency of -3 when it is in its ion form (PO4^3-). It can also form compounds with other elements where the valency can vary depending on the specific compound.
How many what elements can for compounds with expanded octet....I O Cl Xe...?
Elements in the third period or beyond (Si and beyond) in the periodic table can form compounds with expanded octets. This includes elements such as sulfur, phosphorus, chlorine, and xenon. These elements can often exceed the octet rule by forming more than 8 electrons in their valence shell in some compounds.
What name is give to groups 3-12 in periodic table?
Groups 3-12 in the periodic table are called the transition metals. They are located in the middle of the periodic table and are known for their malleability, ductility, and ability to form colorful compounds.
What are aluminums reletives?
Aluminum belongs to group 13 of the periodic table, also known as the boron group. Other elements in this group include boron, gallium, indium, and thallium. These elements share similar chemical properties and tend to form +3 oxidation states in compounds.
What elements have 3 valence elements?
Some elements that have 3 valence electrons include aluminum, boron, and thallium. These elements can form compounds by either losing the 3 valence electrons to achieve a full outer shell, or by sharing electrons to complete their valence shell.
