The explosion of an atomic bomb releases many radioactive isotopes, including strontium-90. Considering the location of strontium in the periodic table, suggest a reason for the fact that this isotope is particularly dangerous for human health.

Q: Describe the development of the Periodic Table?

A: Modern periodic table is made by Dmitri Mendeleev and Lothar Meyer. This modern period law states…

Q: What element is found in period 4, group 4A? Use the atomic symbol to identify the element.

A: Given : Period of element is 4  Group of element is 4 A.

Q: The explosion of an atomic bomb in the atmosphere releases many radioactive isotopes into the…

A: The explosion of atomic bomb occurs as a result of rapid release of energy from a high speed nuclear…

Q: How and by whom was the electron discovered? What basic properties of the electron were reported…

A: Models for electrons- J.Thomson in 1897 discovered electron with the help of cathode ray tube…

Q: In the periodic table below, give the name, symbol, atomic number, atomic mass, period number, and…

A: The periodic table is a table that organizes all of the chemical elements according to their atomic…

Q: can you take a look at two elements located into different corners of the Periodic Table - Lithium…

A: An atom is composed of three main sub-atomic particles; electrons, neutrons and protons. The atomic…

Q: Describe Thomson’s model of the atom. How might it account for the production of cathode rays?

A: To find: The Thomson's model of the atom.  How might it account for the production of cathode rays

Q: beryllium hypochlorite scandium(I) chromate hydrogen telluride

A:

Q: .85 If one gallon of gasoline contains about 2.0 g of lead, how much lead (in kg) is emitted into…

A: This is a pure logic question. Let us take the information given first. 25 miles - 1 gallon It…

Q: What did Henry Moseley and Marie Curie contribute to the development of the periodic table

A: There was important contribution from Henry Moseley and Marie Curie.

Q: How has the understanding of the structure of the atom changed over time? Briefly describe the…

A:

Q: Explain the role of atomic number in determining the identity of an atom.

A: Atomic number(Z) is may be defined as the number of protons present in a neutral(uncharged) atom,…

Q: 2.90 grams of phosphorus is burned in the presence of oxygen and forms 5.14 grams of a phosphorus…

A: We can just subtract the mass of the phosphorus from the mass of phosphorus oxide and get mass of…

Q: Which of the following elements is a good conductor of heat and electricity? neon chlorine carbon…

A: Substance having free electrons undergo movement, By movement they conduct electricity.  These free…

Q: Explain the organization of an atom of carbon.

A: The protons, neutrons, and electrons are the salient features of an atom. The protons present in the…

Q: What do you mean by deuterium ? how it is symbolized ?

A: Given term,           Deuterium

Q: Name the scientist who receives the major credit for the development of the periodic table. In what…

A: The long form of periodic table is the arrangement of all elements in the increasing order of their…

Q: How to infer the presence of the copper ion?

A: The confirmatory tests for copper (II) ion is detected by two method. Method 1: By potassium…

Q: The vitamin niacin (nicotinic acid, C6H5NO2) can be isolated from a variety of naturalsources such…

A: To find: The source of nicotinic acid which is best for use in a multivitamin tablet.

Q: Describe the contributions of the alchemist to the science of chemistry.; Give at least 10 sentences

A: Alchemy was practiced since the ancient period in different places of the world like China, Greek,…

Q: Which of the following elements would have chemical properties similar to Ca   K, Ba, Kr, or Sc

A: Elements from same group have same chemical properties

Q: Which group of three elements contains a transition metal, a halogen, and noble gas? a) S, I, Cu b)…

A: Since the Halogen elements are F, Cl, Br, I, At And noble gases are He, Ne, Ar, Kr, Xe, Rn

Q: 86. the symbol for the atomic number is Z the United States has the largest water footprint of…

A: Given:  Q 86 to 95 for True or False Q 96 to 100 for Matching

Q: Explain what is meant by the periodic table with an explanation of the divisions it consists of and…

A: Periodic table is the important tools in the history of chemistry . It arranged the atomic…

Q: The element belonging to group 3A and period 4 is Gallium Scandium Silicon Aluminum

A: The given questions asks about the identity of element which belongs from 4th period and 3A group.

Q: m b d Halogens Alkali Metals Alkali Earth Metals Noble Gases a. b. c. d. Inert. Do not react with…

A: The periodic table contains different elements arranged in the group and periods . The group one of…

Q: Locate each element in the periodic table and classify it as a metal, nonmetal, or metalloid. a.…

A: Titanium belongs to group 4 and is present in d block. It is a metal. Chlorine belongs to group 17…

Q: Describe what you think happens on an atomic scale when you push a pencil across a piece of paper…

A:

Q: Why we need to detrimine the concentration of trace elements?

A:

Q: The vitamin niacin (nicotinic acid,C6H5NO2) can be isolated from a variety of natural sources such…

A:

Q: A student is asked to identify an element that is highly reactive, solid, and conducts electricity…

A: Highly reactive , solid and conductor of electricity , element present at location 1.  It is…

Q: Boron occurs naturally as 10B and 11B. Which isotope is most abundant? (Refer to the Periodic…

A: The isotopes can be described as the types of the species which have equivalent atomic number…

Q: What is electrostatic force? Use your understanding of electrostatic force and how the number of…

A: We have to explain electrostatic force and its impact on atomic size.

Q: A bicycle part made of titanium, Ti, has a volume of 32 cm . Titanium has a density of 4.50 g/cm .…

A:

Q: It the type of energy that happens in the core of the atom   a. solar b. thermal c. nuclear d.…

A: Solar as the name suggest energy that come from heat and light of sun.

Q: Oxygen, whose atomic number is eight, has three stable isotopes: 16O, 17O, and 18O. Explain what…

A:

Q: Which pair of elements do you expect to be most similar in their chemical properties?a) K and Fe…

A: Most similar in their chemical properties

Q: Introduction of the periodic table: Give a timeline outlining who contributed to the discovery of…

A:

Q: Uranium hexafluoride, UF6, is an important compound used in the enrichment of uranium by gaseous…

A: Where uranium can be found on the periodic table ?

Q: Is Ni and Cu  Different elements, isotopes or ions?

A: Isotopes: Each of two or more forms of the same element that contain equal numbers of protons but…

Q: The synthetic radioactive element gallium is used in many medical studies. Give the number of…

A: Gallium-67 has 31 electrons, 31 protons and 36 neutrons.

Q: Do isotopes have the same chemistry among each other? Do they have the same electron configuration?

A: Isotopes of an element have same number of protons with different number of neutrons in the nucleus.…

Q: 92. The three most stable oxides of carbon are carbon monox- ide (CO), carbon dioxide (CO.), and…

A: Given the three oxides of carbon are as follows: CO CO2 C3O2

Mole Concept

Mole concept is a method to determine the amount of any substance that consists of some elemental particles using a grouping unit called ‘mole’. The mole concept enables one to handle the large amount of small elementary particles. The mole concept can be used in many calculations related to mole calculation, molar amount, mole ratio, and so on, which are significant in chemistry.