What are horizontal rows and vertical columns of the periodic table called?

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In periodic table horizontal lines are called periods and vertical lines are know as groups
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How shall I prepare for IIT without joining any coaching institute? I am in class 11.
focus on basic concepts of subjects, prepare timetable for study and follow this. does not spent too much time on study but start learning on calm mind, do some physical activity also.
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In a metallic bond, why positive ions are called kernels, not cations?
The kernel is an atom without its valence electrons that are weakly bonded; no electron belongs to one nucleus, valence electrons can move one kernel to another. So it is known as kernel, not cation (have valency).
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How would you explain the lower atomic radius of Ga as compared to Al?
Ga is present in 3rd period after the d-block in the periodic table, In this due to poor shielding effect of d electron effective nuclear charge increases that pull outershell electron more strongly hence has smaller size.
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What is the S.I. unit of mass?
Kilogram is the si unit of mass
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Is coaching important for the class 12 science exam?
No need. The thing is you must have basics and be upto date in reading and learning. Just need a compressuve reading of lessons as many times as possible and practice bits questions. It is enough to get good result.
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