Consider the elements He, Ne, and Ar. Can you come up with a reason why they are in the same group in the periodic table?

Q: List the number of elements in periods 3 and 4 of the periodic table. Why does each period have a…

A: The number of elements in periods 3 and 4 of the periodic table and the reason Why does each period…

Q: Explain Bohr’s planetary model of the atom.

A: Bohr’s model consists of a small nucleus (positively charged) surrounded by negative electrons…

Q: how will you order the elements?

A: The periodic table, also known as the periodic table of elements, is a tabular display of the…

Q: Give the main features of Thomson’s Model for an atom.

A: Thomson's model also called as plum pudding model. J.J. Thomson discovered electron in 1904. In this…

Q: What is the main idea in the periodic law?

A: The main idea in the periodic law has to be defined.

Q: What theory explains the underlying reasons for the periodic law?

A: Given information,       The periodic table is a result of the periodic law.

Q: Give the full electron configuration for aluminum (Al).

A: The electron configuration of an atom is the representation of the arrangement of electrons…

Q: What are the four blocks of the periodic table?

A: Periodic table represents the systematic arrangement of elements in which the properties of these…

Q: What is the difference between an orbit (such as in the Bohr model) and electron orbital?

A: Orbit is the Path for elcetrons to revolve around the nucleus. While electron orbital is the 3-D…

Q: Select the pair of elements which have the same number of electrons?

A: An atom can be designated asMAZwhere     A→symbol of the atom    M→mass number= mumber of…

Q: List the number of elements in periods 1 and 2 of the periodic table. Why does each period have a…

A: In the periodic table, there is a total of seven periods and eighteen groups. The horizontal rows…

Q: What are the limitations of Mendeleev's periodic table?

A: Dmitri Mendeleev formulated the first periodic table in which elements were arranged according to…

Q: List the features of Nonmetals?

A: The features of Nonmetals have to be listed below.

Q: List the basic postulates of Dalton’s atomic theory.?

A: The structure of matter is explained by the experimental facts known at the time John Dalton in the…

Q: The elements B, Al, Ca, In and Tl are placed in the same group of the periodic table. Give reason.

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Q: Who is credited with arranging the periodic table? How are the elements arranged in the modern…

A: Periodic table is a table which shows the elements arranged in order of increasing atomic number of…

Q: For lithium atom, there is a large increase from the first ionization energy to the second…

A: Introduction: Ionization energy is least amount of energy that is required for removing one electron…

Q: In bohrs model of the atoms, where are the electrons and protons located?

A: Introduction: Bohr model of an atom was proposed by Neils Bohr in 1913. According to Bohr's model…

Q: • describe similarities and differences between the Bohr model and the quantumn mechanical model of…

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Q: 15. What are the properties of nonmetals? Where are nonmetals found on the periodic table?

A: Properties of Non-metals = Non-metals are the elements that gain electrons from the negatively…

Q: 11. (a) What part of the original Bohr model still seems to be well supported by experimental…

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Q: what are the postulates of Bohr's atomic model ?

A: Postulates of Bohr’s atomic model:Electrons in an atom revolve around nucleus in a definite fixed…

Q: What are two (2) differences between the Thomson model and the Bohr model of the atom? Sketch a…

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Q: 16. Where on the periodic table are metalloids found?

A: The periodic table may be divided into s, p, d and f blocks based on the nature of the orbital in…

Q: (a) Are the elements calcium, barium, and radium in the same group or same period in the periodic…

A: A horizontal row in the periodic table is known as periods and a vertical column in the periodic…

Q: Illustrate and describe the sequence in which ten electrons occupy the fiveorbitals related to an…

A: The sequence in which ten electrons occupy the five orbitals related to an atom’s d sublevel has to…

Q: 17. What is a family or group of elements?

A: A family or group of elements has to be defined.

Q: Usefulness and limitation of periodic table?

A: Interpretation: Uses and limitations of periodic table are to be provided.

Q: give some similarities that exist among the elements of the group 1

A: Group 1 in periodic table consists of following elements H Li Na K Rb Cs Fr

Q: Explain the contributions of Johann Döbereiner and John Newlands to the organization of elements…

A: Johann Wolfgang Dobereiner was a chemist in the early 1800s, when the periodic table wasn't in…

Q: What is the reason why electrons do not move from the s shell to the p shell in the elements?

A: Each electron in an element is associated with a shell of particular amount of energy . These shells…

Q: Are the electrons in shells that are closer to the nucleus, higher in energy? Or lower in energy?…

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Q: chlorine ) Would you expect the ion to be larger or smaller in volume than the neutral atom? Why?

A: The atomic no. of Cl is 17. It's electronic configuration is: 1s22s22p63s23p5 It has 7 electrons in…

Q: What was the major contribution of Bohr’s atomic model?

A: Bohr made a major contribution in the understanding of structure of atoms and in the development of…

Q: Why does the fourth period in the periodic table contain 18 elements?

A: The periodic table is the tabular arrangement of elements which are arranged in the increasing order…

Q: Which is the smallest atom in Group 7A of periodic table? Why?

A: The element present in Group 7A of periodic table are fluorine (F), chlorine (Cl), bromine (Br),…

Q: Is a Carbon Atom smaller than a silicon Atom?

A: Since we know that on going down in a group of periodic table, the size of atom increases. This is…

Q: Using arguments of quantum mechanics, explain why elements in the same group of the periodic table…

A: The elements in a modern periodic table are arranged in increasing order of their atomic number. In…

Q: 7. How do man made elements fit into the periodic table?

A: At present 112 elements are known , among them 88 are naturally occurring elements and the remaining…

Q: Do nonmetals tend to gain or lose electrons? Do theybecome cations or anions?

A: Is nonmetals tend to gain or lose electrons has to be given,

Q: Elements of a group in the periodic table

A: The periodic table is the arrangement of chemical elements according to their atomic number. These…

Q: How can we determine the radius of the atom?

A: The radius of the atom for a covalently bonded compound is the distance which is measured between…

Q: Define and state Mendeleev’s periodic law.

A: Dmitri Mendeleev was the scientist who gave the periodic law based on atomic mass of the elements.…

Q: Please explain in depth why the general trend exists for elements getting smaller as you move across…

A: Atomic size is defined as the distance from the center of nucleus to the outermost shell.

Q: How is the Bohr model useful in describing the atomic structure? What downsides does the Bohr model…

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Q: Define ‘periodic motion’. Why do you think in chemistry we had a chart called the Periodic Table?

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Q: Roughly sketch a periodic table shadowing the location of the three principle type of elements?

A: Periodic table is the arrangement of elements according to their atomic number.

Q: How would a planetary (solar system) model of the atom dif-fer from a key assumption in Bohr’s…

A: There are several models that have been proposed to explain the structure of the atom. Among them,…

Q: What is the quantum-mechanical model of the atom?

A: The formation of quantum mechanical model of an atom was from the application of Schrodinger wave…