Recent questions in Classification of Elements and Periodicity in Properties

List these atoms in order of decreasing size: Br, Cl, Ge, K, S.

asked Jul 23, 2014 by balaji.thirumalai

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Which of the following statements is true regarding atomic radii ?

asked Jul 23, 2014 by balaji.thirumalai

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Arrange the following monatomic ions in order of increasing atomic radii: P$^{3–}$, Cr$^{6+}$, Ca$^{2+}$, Cl$^{-}$, Ti$^{4+}$.

asked Jul 23, 2014 by balaji.thirumalai

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Rank each set of ions in order of decreasing size: Ca$^{2+}$, Sr$^{2+}$, Mg$^{2+}$.

asked Jul 23, 2014 by balaji.thirumalai

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Rank the elements in each of the following sets in order of decreasing First Ionization Energy IE$_1$: K, Ca, Rb

asked Jul 23, 2014 by balaji.thirumalai

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Rank the elements in each of the following sets in order of decreasing First Ionization Energy IE$_1$: K, Ca, Rb

asked Jul 23, 2014 by balaji.thirumalai

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Rank the elements in each of the following sets in order of decreasing First Ionization Energy IE$_1$: Sb, Te, Sn

asked Jul 23, 2014 by balaji.thirumalai

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Rank the elements in each of the following sets in order of decreasing First Ionization Energy IE$_1$: Kr, He, Ar

asked Jul 23, 2014 by balaji.thirumalai

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Rank the set of main group elements in order of decreasing atomic size: $ Sr, Ca, Rb$

asked Jul 23, 2014 by balaji.thirumalai

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Rank the set of main group elements in order of decreasing atomic size: $ Br, Rb, Kr$

asked Jul 23, 2014 by balaji.thirumalai

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Rank the set of main group elements in order of decreasing atomic size: $K, Ga, Ca$

asked Jul 23, 2014 by balaji.thirumalai

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Rank the set of main group elements in order of decreasing atomic size: $Ca, Mg, Sr$

asked Jul 23, 2014 by balaji.thirumalai

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In which of the following arrangements is the order not according to the property indicated against it?

asked Mar 16, 2014 by balaji.thirumalai

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The ionization enthalpy of hydrogen atom is $1.312 \times 10^{6} \; J/mol$. The energy required to excite the electron in the atom from $n=1 \rightarrow n = 2$ is:

asked Mar 16, 2014 by balaji.thirumalai

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Among the following elements, the one having the highest ionization energy is

asked Mar 16, 2014 by balaji.thirumalai

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The formation of the oxide ion $O^{2-}_{(g)} $ requires first an exothermic and then an endothermic step, as shown below:

asked Mar 15, 2014 by balaji.thirumalai

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Which element can be found in nature in the free (uncombined) state?

asked Mar 15, 2014 by meena.p

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Which metal is obtained commercially by the electrolysis of salt?

asked Mar 15, 2014 by meena.p

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At $STP,$ which substance is the best conductor of electricity?

asked Mar 15, 2014 by meena.p

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Which of the following elements' atom has the greatest ability to attract electrons?

asked Mar 15, 2014 by meena.p

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The first ionization energy of an element is 736 kJ per mole of atoms. An atom of this element in the ground state has a total of how many valence electrons?

asked Mar 15, 2014 by meena.p

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As atoms of elements in Group 16 are considered in order from top to bottom, the electronegativity of each successive element

asked Mar 15, 2014 by meena.p

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Atoms of elements in a group on the Periodic Table have similar chemical properties. This similarity is most closely related to the atoms'

asked Mar 15, 2014 by meena.p

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Which set of elements contains a metalloid?

asked Mar 15, 2014 by meena.p

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When combining with nonmetallic atoms, metallic atoms generally will

asked Mar 15, 2014 by meena.p

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Arrange the following in order of increasing ionization energies: Ar, Se, S.

asked Mar 15, 2014 by balaji.thirumalai

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Which halogens are gases at $STP?$

asked Mar 15, 2014 by meena.p

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Which element in Group 15 has the strongest metallic character?

asked Mar 15, 2014 by meena.p

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Linus Pauling defined electronegativity as the power of an atom in a molecule to attract electrons. Given the bond disassociation enthalpies, $\varepsilon_{C-C} = 348\; \text{ kJ/mol}, \varepsilon_{C-H} = 412 \; \text{ kJ/mol}, \varepsilon_{H-H} = 436 \; \text{ kJ/mol}$, what is the Pauling elctronegativity of $C$? (Electronegativity of $H$ is $2.1$)

asked Mar 15, 2014 by balaji.thirumalai

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Given the following assertion and reason, choose the correct answer:

asked Mar 15, 2014 by balaji.thirumalai

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According to periodic table, which of the following elements has the smallest atomic radius?

asked Mar 14, 2014 by meena.p

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When a metal atom combines with a nonmetal atom, the nonmetal atom will

asked Mar 14, 2014 by meena.p

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Which compound forms a colored aqueous solution?

asked Mar 14, 2014 by meena.p

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Which element has the highest first ionization energy?

asked Mar 14, 2014 by meena.p

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Which three groups of the Periodic Table contain the most elements classified as metalloids (semimetals)?

asked Mar 14, 2014 by meena.p

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The element ununoctium belongs to

asked Mar 12, 2014 by meena.p

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The correct order of first ionization potential is :

asked Mar 12, 2014 by meena.p

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The formation of $O^{2-}(g)$ starting from $O(g)$ is endothermic by $603\;kjmol^{-1}$ .If electron affinity of O is$ -141\;kjmol^{-1}$, the second electron affinity of oxygen would be :

asked Mar 12, 2014 by meena.p

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The Electronic configuration of group 15 is

asked Mar 12, 2014 by meena.p

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The electron configuration of Actinides are gives as

asked Mar 12, 2014 by meena.p

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In Group 13 the first member is

asked Mar 11, 2014 by meena.p

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F ion has smaller size than F atom

asked Mar 11, 2014 by meena.p

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Which of the following configuration is expected to have max different in second and third ionization energy :

asked Mar 11, 2014 by meena.p

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In the periodic table the metallic character of elements:

asked Mar 11, 2014 by meena.p

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In the periodic table Electronegativity of elements :

asked Mar 11, 2014 by meena.p

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With the increase in Atomic number in a period

asked Mar 11, 2014 by meena.p

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1 ev of energy is equivalent to

asked Mar 11, 2014 by meena.p

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Which of the following elements has zero electron affinity ?

asked Mar 11, 2014 by meena.p

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Which of the following never has an oxidation state +1?

asked Mar 11, 2014 by meena.p

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Which of the following elements is a metalloid:

asked Mar 11, 2014 by meena.p

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