Topic - Trends in the modern Periodic Table

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Science Class X > Periodic classification of Elements > Making order out of chaos - The modern Periodic Table > Trends in the modern Periodic Table

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Anisha Banerjee

Q. What is the unit for atomic radius? ... 3 Like

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1 answer under Trends in the modern... 1 year, 11 months ago

A. dear anisha, atomic radius is measured usually in terms of ANGSTROM 1 ANGSTROM= 1/10000000000 METRES link
1 year, 11 months ago

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Anisha Banerjee

Q. If ionization energy of an element in a group is x kJ/mol, then the possible ionization energy value of the element just below is ... 2 Like

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1 answer under Trends in the modern... 1 year, 11 months ago

A. Moving left to right within a period or upward within a group, the ionization energy generally increases. Hence, we can delete the options 6x/5 and 4x and 7x/5 as they are all more than x. ... link
1 year, 11 months ago

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Anisha Banerjee

Q. What is electropositivity? ... 2 Like

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1 answer under Trends in the modern... 1 year, 11 months ago

A. Electropositivity is a measure of an element's ability to donate electrons, and therefore form positive ions refer: http://en.wikipedia.org/wiki/Electropositivity link
1 year, 11 months ago

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Anisha Banerjee

Q. Why does sodium have a higher density than lithium, potassium has a lower density than sodium? ... 2 Like

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1 answer under Trends in the modern... 1 year, 11 months ago

A. Density is mass per unit volume. Now, in this case of alkali metals, mass dominates, as we go down the group, the mass increases, hence, density should increase. This is true when we consider the... link
1 year, 11 months ago

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Anisha Banerjee

Q. Ions X+ and Y- isoelectronic. Identify the atom with greater atomic size. ... 2 Like

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1 answer under Trends in the modern... 1 year, 11 months ago

A. We must understand that they are isoelectronic, hence, X+ originally has one electron more, while Y- originally has one electron less. Now, in their neutral states X will be placed before Y, as it is... link
1 year, 11 months ago

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