Alll are correct. Matter is literally everywhere
The reason responsible for the variation in atomic radii in group 3A,4A,5A,6A is increasing size of the nuclear charge.
As we move across the period in the periodic table, the size of the nuclear charge is increased because more protons are added but there is no increase in the number of shells.
As such, the outermost electrons experience greater attraction for the nucleus from left to right across the period.
This increased attraction causes the atoms to become smaller across the period.
Hence, across the period, the atomic radii of elements in groups 3A,4A,5A,6A decreases steadily.
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The answer to this question is 1s^2.
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B. stars form large groupings
