GK
GENERAL SCIENCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Increase
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Decrease
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Either A or B
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None of the above
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Detailed explanation-1: -On moving from left to right in a period of the periodic table, the atomic number of elements increases.
Detailed explanation-2: -As we go across a period from left to right, we add a proton to the nucleus and an electron to the valence shell with each successive element. As we go down the elements in a group, the number of electrons in the valence shell remains constant, but the principal quantum number increases by one each time.
Detailed explanation-3: -Because the electrons of all the elements in a period have the same amount of energy (i.e. they’re pretty much equal) and an increasing number of protons gives the nucleus more “pulling power", the electrons are pulled more tightly to the nucleus. This makes the atom smaller.