The value of the principal quantum number (n) for the outermost shell or the valence shell indicates a period in the Modern periodic table. The periodic table is a tabular arrangement of the chemical elements, organized on the basis of their atomic number (number of protons in the nucleus), electron configurations, and recurring chemical properties. In the modern periodic table, the period indicates the value of: Which of the following oxides is amphoteric in character?ĬaO is basic CO 2 is acidic SiO 2 is weakly acidic. Number of valence electrons 3s☣p³ = 5 and valency = 3 in ground state. The group number, number of valence electrons, and valency of an element with the atomic number 15, respectively, are: Hence, on paulings scale, the element next to fluorine is Oxygen. In the case of a covalent bond, based on the bond energies, Pauling calculated the differences in electronegativity between atoms in the bond and assigned a value of 4 to fluorine, which is the most electronegative element, and others were calculated with respect to that value. When we analyse the trend in periodic table, we can see that the degree of electronegativity decreases while going down the groups, while it increases across the periods. Pauling explained electronegativity as the power of an atom in a molecule to attract electrons towards it. On the Paulings electronegativity scale the element next to F is The metallic character decreases along the period. The valency initially increases then decreases. Which of the following properties generally decreases along a period? S and p block elements except inert gas is known as representative elements.
Those elements which have less than 8 electrons in outermost shell are representative. Representative elements are those which belong toĮlements in which all the inner shells are complete but outer shell is incomplete is known as representative elements i.e. Atoms with fully or partly filled orbitals have high ionisation potential. The ionisation potential decreases as the size of the atom decreases. The energy required to remove the most loosely bound electron from an isolated gaseous atom is called the ionisation energy. The correct order of first ionization potential among following elements, Be, B, C, N and O is The electronic configuration of element with atomic number 35 is 3d 104s 2 4p 5.
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