Modern Periodic Table
Chapter 7: Modern Periodic Table
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See all →- How the atomic size vary in a group and across a period? Explain with suitable example. Answer: Atomic size increases down a group and decreases from left to right across a period. Down a group: each new element has one more she... 1
- Define ionization enthalpy. Name the factors on which ionisation enthalpy depends? How does it vary down the group and across a period? Variation of ionization energy down the group: On moving down the group, the ionization enthalpy decreases. This is because the electron is... 2
- What are the valence electrons ? For s-block and p-block elements show that number of valence electrons is equal to its group number. Electrons present in the outermost shell of the atom of an element are called valence electrons. 3Li is an s-block element and its electroni... 1
- Compare chemical properties of metals and non metals. The difference in chemical properties between metals and nonmetals. Nonmetals Metals 1. Nonmetals form acidic or neutral oxides when they re... 1
- Explain : electronegativity and electron gain enthalpy. Which of the two can be measured experimentally? The ability of a covalently bonded atom to attract the shared electrons toward itself is called electronegativity (EN). Electronegativity ca... 1
- Why the elements belonging to the same group do have similar chemical properties ? Chemical properties of elements depend upon their valency.Elements belonging to the same group have the same valency. Hence, the elements be... 1