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Anna007 [38]
3 years ago
5

How does atomic radius change from left to right across a period in the periodic table?

Chemistry
2 answers:
jek_recluse [69]3 years ago
8 0
Atomic radius decrease across the period from left to right because in moving from left to right the nuclear charge increase but the number of electrons remains the same... this unusual disturbances make electrons come closer to the nucleus due to the reason that more protons are present in nucleus of atom as compared to the no of electrons . So attraction occurs between two and thus causes the atomic radius to decrease as going from left to right
Ostrovityanka [42]3 years ago
3 0

Answer: decrease

Explanation:

Atomic radii is the measure of the size of its atoms, usually the mean distance from the centre of the nucleus to the boundary of the surrounding shells of electrons.

The elements in the periodic table are arranged in order of increasing atomic numbers. The horizontal rows are called as periods and vertical columns are called as groups.

The size of an atom decreases as we move across the period because the electrons get added to the same shell and the nuclear charge keeps on increasing. Thus the electrons get more tightly held by the nucleus.

As, the valence electrons come near to the nucleus due to the increased attraction between the nucleus and the shared pair of electrons.

Thus atomic radius decrease from left to right across a period in the periodic table.

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<u>(Part 1)</u>

To find the mass of NaCl, you need to multiply the given value (1.46 moles) by the molar mass of NaCl. This measurement is the atomic masses of the elements times each of their quantities combined. In this case, there is only one mole of each element in the molecule. Moles should be located in the denominator of the conversion to allow for the cancellation of units. The final answer should have 3 sig figs to reflect the given value.

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<u>(Part 2)</u>

I do not know which other question the second part is referring to, so I will just use the moles given in the first part. To find the formula units, you need to multiply the given value (1.46 moles NaCl) by Avogadro's Number. This conversion represents the number of formula units found in 1 mole of the sample. The moles should be in the denominator of the conversion to allow for the cancellation of units.

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------------------------  x  -----------------------------  =  8.79 x 10²³ formula units NaCl
                                          1 mole

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