Look at the locations of potassium andcalcium on the periodic table. Form a hypothesis toexplain why the melting point of calcium is considerablyhigher than the melting point of potassium.

Q: Give a reason why hydrogen might be placed along with the group 1A elements of the periodic table.

A: Periodic table gives the information of chemical elements arranged according to atomic number,…

Q: c) Oxygen and sulphur belong to the same group but oxygen is in Period 2 and sulphur is in Period 3.…

A: Ionization energy is simply determined as the energy required to eliminate one electron from the…

Q: Place the following in order of increasing radius. Br Na+ Rb+

A: The radius of an ion depends on its charge. A negative charge on an ion increases the repulsion…

Q: Which of the following would have the largest radius? a. O2- b. Mg2+ c. F- d. B3+

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Q: which of these elements have the smallest atomic radius? silicon sodium cholrine sulfur phosphorus

A: The question is based on the concept of periodicity of properties. we have to identify the smallest…

Q: Use the electron configurations of the alkaline earth metalsto explain why they tend to form 2+…

A: We have alkaline earth metal, we have to explain why they tend to form the +2 ions.

Q: What are the three types of oxides? Using chemical equations and any other information to support…

A: Three types of oxides: 1. Acidic oxide 2. Basic oxide 3. Amphoteric oxide

Q: Write the balanced chemical equation for the reaction of solid potassium with liquid water?

A: Given: Reaction of solid potassium with liquid water.

Q: Which of the following elements would you expect to have the smallest atomic radius? Ga K Se Kr

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Q: Which one has the largest atomic radius?

A: Atomic radius is the distance from the centre of nucleus to the outermost shell of an atom. In a…

Q: Use the following key to classify each of the elements below in its elemental form: C. Metallic…

A: The classification of elements are given below

Q: Acidic oxide is formed by: a only metals  b only non metals c  both non metals and metalloids

A: Oxides are chemical compounds with one or more oxygen atoms combined with another element (e.g.…

Q: 8. Based on what you know about the patterns of elements as you move down a period on the Periodic…

A: 8.) Phosphorus and Nitrogen belongs to the same group i.e., group 15 yet both behaves differently…

Q: 3. The Statue of Liberty consists of copper plates on an iron skeleton. The statue was recently…

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Q: Which of the following group I elements does not form 3 types of oxides? Select one: а. Na O b. K С.…

A: Group I elements reacts with oxygen and forms three types of oxides a) peroxides :-  Peroxide…

Q: Which element has the smallest radius? S, Nb , Cs

A: Atomic Radius- It is defined as distance of last shell electron from nucleus of an atom is called…

Q: What is the orbital diagram for Magnesium Mg 12

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Q: Directions: Draw the orbital diagram of the following elements and identify the type of magnetic…

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Q: List and briefly describe the Earth’s four spheres.

A: The question is based on the concept of environmental Chemistry. we have to describe and explain the…

Q: Draw an orbital diagram to depict the electron configuration of the magnesium ion, Mg2+.  10. How…

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Q: The transparent form of beryl (molecular formula = BegAl2Si6O18) that is green is called emerald.…

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Q: Which element has the LARGEST atomic radius? O Mg O Cs O F

A: Mg Si Cs F                                    Which one has the largest atomic radius.

Q: (O O Figure 2 shows the relative melting points of some of the elements in period 2. Li Be Ne Figure…

A: Following is the relative melting point curve in period 2.

Q: Arsenopyrite is a mineral containing As, Fe, and S. Classify each element as metal, nonmetal, or…

A: • Arsenopyrite, AsFeS is a mineral. It is abundant and widespread   • Arsenopyrite contains As, Fe…

Q: What is the orbital diagram for Nitrofen N 7

A: Three rules are followed while drawing the orbital diagram of any element. These three rules can be…

Q: Question attached

A: An atom is mainly composed of three sub-particles; electrons, protons and neutrons. These particles…

Q: What alkali metal has the largest atomic radius?

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Q: determine the theoretical density of nickel has atomic radius 0.1246 nm and atomic weight of it 59.7…

A: Nickel crystallizes in FCC unit cell. Write the relation of edge length with radius of the cell.…

Q: Compare and contrast the characteristics of the theoretical materials of metallic materials (iron)…

A: Non destructive testing is method used by industry to evaluate properties of materials, components,…

Q: Name the anomalous properties of lithium.

A: Anomalous properties of lithium are : Lithium is least reactive but strongest reducing agent among…

Q: Why is silicon and germanium classified as a semimetal? including electron configurations

A: Silicon and germanium acts as a semiconductor when they are kept at specific conditions.

Q: Calculate the radius of the copper atom, given that copper has an fcc crystalstructure, a density of…

A: Given data Atomic mass  = 63.55 g/mole density = 8.89 g/cm3  Copper has FCC Unit cell  Standard…

Q: Place the following in order of increasing atomic radius.

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Q: Arrange these elements according to atomic radius. Largest radius Pb Sn Ge Si C Smallest radius

A: The given elements are Pb, Sn, Ge, Si and C. All these elements are element of group 14 in periodic…

Q: Using the idea of dobereiner’s triads, what conclusion could have been made about magnesium, had…

A: Dobereiner’s triads : To segregate and group similar elements together  Sir Johanan Wolfgang…

Q: Based on results of his study of atomic x-ray spectra, Moseley discovered a relationship that…

A: The elements present on the earth are tabulated in a table form known as periodic table. The…

Q: Which of the following has the largest atomic radius? A) K¹⁺ B) S²⁻ C) Ar D) Cl¹⁻ E) Ca²⁺

A: Which of the following has the largest atomic radius?

Q: 14. a) Order the following elements from lowest to highest electron affinity: Si, Sn, Cl. b) State…

A: Electron affinity is the energy released when an electron is added to the outermost shell of an…

Q: ionic radius

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Q: 4. Which of these two metals will have a higher melting point? Explain your choice. Na and Al

A: Al has higher melting point than Na.  Metallic lattice of sodium is weak than Aluminium.

Q: Write a general equation for the reaction of an alkali metal with each substance.a. a halogen b.…

A: Alkali metals are first group elements. They show a fixed valency of +1. Halides show -1 unit…

Q: Write balanced equations for the following reactions:potassium oxide with water,

A: The balanced equation is the chemical equation for a chemical reaction in which the no of atoms…

Q: Which of the following is not true? O a. The transition metals are characterized by partially filled…

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Crystal Structures

Solids are present all around us. They have different properties and applications. Diamond and graphite are two well-known solids. Diamond is the hardest material in the world and is used in making jewelry. Graphite on the other hand is soft. The lead of your pencil is graphite. Why are they so different in appearance and properties despite the fact they are chemically the same? Both are allotropes of carbon. The answer lies in the structure, the way constituent particles are arranged in the solids.