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as you go from left to right across the Periodic Table, you are adding one more proton every time hence increasing the nuclear charge of the atom. An increased nuclear charge means the nucleus attracts the electrons more to it hence the size of the atom decreases as it "tightens". hence the atomic radius decreases every time.
Wiki User
∙ 11y ago
Wiki User
∙ 11y agoit is because there is no electron entering a new shell so the nuclear charge(+) over an electron cloud(-) is increased due to increase in protons in nucleus
Wiki User
∙ 11y agoBecause with the increase of atomic number,the effective nuclear charge increases gradually because of addition of more and more protons in the nucleus.
Wiki User
∙ 13y agobecause the electronegativity increases.
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Why does atomic size increase from left to right across a period?
atomic size decreases across a period
Does an element on the periodic table decrease in atomic size when you move across a period from left to right and when you move down a group?
1. In a period is a trend of decrease from left to right but it is not absolute.2. In a group the atomic radius increase moving down.
How do the metallic properties of the elements change as you move from left to right on the periodic table?
Metallic character decreases as we move across a period. The electronegative character increases as we move across a period. So the element across the period will be non mettalic in nature.
Why the size of atom does not decrease regularly in a period?
pagal u tell
What is the trend in atomic size across the period from sodium to argon?
across a period, the atomic size decreases as the effective nuclear charge increases.
Why the size of an atom does not decrease regularly in a period?
the size of atom doesn't decrease regularly due to the reason of lanthanide contraction .there is slightly increase or or almost no increase in atomic radius from 5th to 6th period in transition metal .
Why does atomic size increase from left to right across a period?
atomic size decreases across a period
Why size of atom does not decrease regularly in a periode?
pagal u tell
Does elements on the periodic table decrease in atomic size when you move across a period from left to right and when you move down a group?
1. In a period is a trend of decrease from left to right but it is not absolute.2. In a group the atomic radius increase moving down.
Does an element on the periodic table decrease in atomic size when you move across a period from left to right and when you move down a group?
1. In a period is a trend of decrease from left to right but it is not absolute.2. In a group the atomic radius increase moving down.
Why does the size of the elements decrease across a period?
In a period, the number of shells of all the elements is same. So, this basically means that all must have the same radius or same size. but, this is not the case because, as we move across a period, one electron gets added. So, as the negative charge of the atom keeps increasing or as the atomic number keeps increasing, the number of positively charged protons also keeps increasing. This means, there is more nuclear force of attraction between the nucleus ( where protons are present) and electrons of the atom. Thus, this nuclear force causes the nucleus to hold on to the electrons more tightly ,i.e, the electrons get closer to the nucleus which means the shells which contain the electrons are pulled closer. This means, the atom's radius keeps decreasing. Thus, across a period, the atomic size decreases due to the increasing nuclear force of attraction.
How do the metallic properties of the elements change as you move from left to right on the periodic table?
Metallic character decreases as we move across a period. The electronegative character increases as we move across a period. So the element across the period will be non mettalic in nature.
Why the size of atom does not decrease regularly in a period?
pagal u tell
What is the trend in atomic size across the period from sodium to argon?
across a period, the atomic size decreases as the effective nuclear charge increases.
How does the atomic radius change from the left to the right horizontal row in the periodic table?
from left to right the atomic radius decreases as the electrons that get added are added in the same shell as they are in the same period. the shielding effect remains constant but the proton number increases which inturn increases the effective nuclear pull on the electrons bringing the electrons closer to the nuclei hence decreasing the radius of the atom
Atomic size generally as you go down a group?
Atomic size generally increases as you go down a group
How does ionization enthalpy vary as you move across the periods vary from left to right?
in a period size decreases from left to right and hence electrons are more tightly held to the nucleus. so electron gain enthalpy increases across a period . down the period size increases and thus in general electron gain enthalpy decreses .
