Does the metallic characteristic of a main-group element increase or decrease as we move down a family? Explain why.

Q: How does the Mineral Family- Oxides is used in everyday life and in Engineering activities?

A:

Q: How many types of boranes does boron forms?

A: Boranes are the compounds containing boron and hydrogen atoms. These types of compounds can be…

Q: Assume that you have these materials: a) Li (s); b) Br2 (l); Ge (s) and d) Si(s). Choose the best…

A: For a good electrical conductor, material should have free electron to move.

Q: 109 1,000,000,000 nano n Calculate the % (mass/mass) composition, ppm, and ppt of Si in an alloy of…

A:

Q: Which fluorinating agent are oftenly used instead of F2? Write two chemicalequations showing their…

A: Fluorinating agents:          An active species which contains fluorine atom as their either an…

Q: An element forms an oxide, E2O3, and a fluoride, EF3.(a) Of which two groups might E be a member?(b)…

A: a) The oxidation state of E is +3 as it forms E2O3 and EF3 thus E belongs to 3A or 3B group.

Q: An element forms an oxide, E₂O₃, and a fluoride, EF₃.(a) Of which two groups might E be a member?(b)…

A: a. (a) When element E form oxide E2O3 then oxidation state of E is +3. When it forms fluoride EF3…

Q: In our experiment, Magnesium should be heated or burned gradually in a closed crucible? اختر احدى…

A: The solution is given below -

Q: How are Metallic hydrides formed?

A: ANSWERE IS DISCUSSED BELOW ;

Q: What is the valence electron configuration for the Group 3A elements? How does metallic character…

A:

Q: In the mineral beryl, six silicate tetrahedra are connectedto form a ring as shown here. The…

A: Given:

Q: sketch a diagram showing the formation of energy levels from the valence orbitals for Li, Li2, Li3,…

A: Diagram showing the formation of energy levels from the valence orbitals for Li, Li2, Li3, Li(n). On…

Q: What are the negative effects of sulphur oxides on environment?

A: Sulfur oxides are produced from burning of fossil fuels and smelting of iron.

Q: The lanthanide elements reacts with oxygen to give compounds of the type Ln2O3.However,the are…

A: Answer: a. Mass percentage of Tb is 73.945% Mass percentage of O =…

Q: In some reactions, Be behaves like a typical alkaline earth metal; in others, it does not. Complete…

A: To find: Complete and balance the given equation and  Determination of reaction in which Be behave…

Q: Thortveitite is a mineral that contains the silicate ion [Si2O7]6-. The structure of this ion is…

A:

Q: What are the two most abundant elements by mass in the earth’s crust, oceans, and atmosphere? Does…

A: The main composition of amino acid is carbon, oxygen, hydrogen, and nitrogen. Since Earth's crust…

Q: Give a few examples of non-stoichiometric metal hydrides

A: HYDRIDES may be defined as:- Hydrogen under certain conditions combines with almost all elements,…

Q: How do you find the oxidation numbers of Cr and P in the formula unit Cr(PO4)2?

A:

Q: How are the silica tetrahedrons linked for CaSiO3 ? Which class of silicates does this compound…

A: The given compound CaSiO3 is example of pyroxene. The main formula unit in it is SiO32-. The ionic…

Q: How are the silica tetrahedrons linked for ZrSiO4? Which class of silicates does this compound…

A: The way how silica tetrahedrons linked for ZrSiO4 are shown as follows,

Q: 9. The general formula of silicate ion present cyclic silicates is (SIO3)n2n- O sio44- Si2052-…

A: Cyclic silicates contain three or more tetrahedral SiO42- units. These units are linked by two…

Q: Tarnishing of lanthanides occurs due to the formation of their Salts O Acids Oxides

A: In the modern periodic table, Lanthanides are rare earth elements. The atomic number of these…

Q: What happens when an alkaline hidride is electrolysed

A: Introduction :  Alkaline hydrides are ionic hydrides they conduct electricity in molten state .

Q: Describe the physical properties of metals?

A: The physical properties of metals has to be given,

Q: What is white phosphorus?

A:

Q: How do the acidities of the aqueous solutions of the alkaline earth metal ions change in going down…

A:

Q: Basic physical properties of sulphate group minerals and economical use of these properties. Write…

A: Sulphate group minerals have sulphate ion (SO42-) in their structures. It occurs as gangue minerals…

Q: 1. What are the two major metal groups? Define them and name the main sub-categories of each group.

A: Two major groups of metals are 1). Ferrous 2). Non ferrous Ferrous

Q: The lanthanide elements react with oxygen to give compounds of the type Ln2O3 (where Ln stands for a…

A: a)  Given that : % mass of Tb = 73.945 % Thus, % mass of O = 100 - 73.945 = 26.055 % Let us consider…

Q: Some of the water on Earth was formed by reactions of iron and silicon oxides and methane. Write the…

A: To write the balanced  equation for the reaction of ferric oxide and methane

Q: Why is Li best reducing agent where as Fluorine is best oxidizing agent ?

A: Reducing agents are the ones which helps in the reduction of other substances and itself gets…

Q: What is the difference between chain and cyclic silicates?

A:

Q: Does roasting increase or decrease the mass of sulfides?

A: During the roasting of sulfide ores , sulfides are converted into oxides and sulfur is converted…

Q: Why is Group I elements known as the most electropositive element?

A: Electropositive nature of the elements is determined by their ability to lose the valence electrons.…

Q: (a) Which poisonous gas is evolved when white phosphorus is heated with Cone. NaOH solution? Write…

A:

Q: 9. Assume that you have these materials: a) Li (s); b) Br2 (1); Ge (s) and d) Si(s). Choose the best…

A: Metals are good conductors because of presence  of free electrons.

Q: What is a hydride and how are they classified? Mention the characteristics of each one

A: We have to classify hydride

Q: 3. Why might arsenic be able to substitute for phosphorus?

A: Arsenic is able to substitute phosphorus because both have  similar  chemical properties.

Q: Which is a zinc ore and is used in paints, sunscreen and coins? A. Anhydrite B. Bauxite C.…

A:

Q: Define the term silicates?

A: Silicates are the compounds of Si and O.

Q: The melting points of alkaline earth metals are many timeshigher than those of the alkali metals.…

A: Alkali metals The elements of group 1A are called alkali metals. They include Li, Na, K, Rb, Cs…

Q: What is the main characteristic that determines whether or not an element is a main-group element?

A: Transition metal elements forms covalent bond easily with other elements than the Main group…

Q: Discuss similarities and differences in structure, availability, and properties of the two groups…

A: Similarities of Alkali metals and Alkali earth metals: The alkali and Alkaline earth metals belong…