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Why do atomic radius decrease from the left to the right on the periodic table?
Wiki User
∙ 9y ago
Effective nuclear charge (Z) increases going across a row in the Periodic Table. So when increasing amounts of protons and electrons to an atom(within the same level or row) the protons are more able to hold onto electrons tightly , reducing size.
Wiki User
∙ 16y ago
Wiki User
∙ 13y agoSodium (Na) has 11 protons in its nucleus, 1 valence electron, and 10 non-valence (inner shell) electrons. Because the charges of protons and electrons are equal and opposite, we can say that one electron will cancel out one of the protons. So those 10 inner shell electrons are going to cancel out 10 of those protons in the nucleus. Now let's focus on that one outer electron. Because the 10 inner-shell electrons have taken up 10 protons, the valence electron is held on by only one proton. Thus, its effective nuclear charge is 1.
Magnesium (Mg) has 12 protons in its nucleus, 2 valence electrons, and 10 non-valence electrons. As with the sodium atom, the 10 inner shell electrons cancel out 10 of the protons. Then we look at one of the two valence electrons. It will be held on by 2 protons. Thus, its effective nuclear charge is 2.
Now we can see why magnesium is smaller than sodium. A valence electron on sodium is held close to the nucleus effectivelyby one proton. A valence electron on magnesium is held close to the nucleus effectively by two protons. Therefore, the stronger pull on the magnesium valence electrons causes the electrons to move closer to the nucleus and the atomic radius is lessthan that of sodium.
ShieldingThe model described above is simplified. There's one more factor that we have to account for. Let's go back to the sodium atom. The 10 inner electrons are going to "shield" the valence electron from the positive nucleus. So the pull that the one valence electron "feels" is going to be less than one due to the interference or shielding of the inner electrons. This means that the atomic radius is going to be a bit bigger than originally predicted. This also forms the basis for the increasing atomic radius going down a group.Wiki User
∙ 12y agowhen we go from left to right in a periodic table one atom is added with an electron in the same increasing shell. if electron is added then a proton is also added to the nucleus of that atom this results in the increasing of nuclear energyin the nucleus thus the attraction between the nucleus and the outermost electron increases thus the size of the atom decreases while going from left to right in a period of the periodic table.
Wiki User
∙ 9y agoAtomic radius decreases from left to right in periodic table. This is due to increase in nuclear charge.Across a period, more number of elements enter into same shell.The effective nuclear charge attracts the electrons and hence its size decreases.
Wiki User
∙ 14y agothe electro
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electrons
Wiki User
∙ 11y agoAcross a period (from left to right) the effective nuclear charge increases and hence the size of an atom decreases.
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What happens to the atomic radius when you go from left to right on the periodic table of elements?
The atomic radius decrease, with several exceptions in periods 6 and 5.
WHAT BEST STATES THE TREND IN ATOMIC RADIUS ACROSS THE PERIODIC TABLE?
As you move across the periodic table from left to right (across a period), the atomic radius of the elements tends to decrease.
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.
What happens to the atomic radius as you move down the periodic table?
Down a group, the atomic radius increases as the number of shells or energy levels increases.
What happens to the atomic radius when you go from left to right on the periodic table?
As a general rule, when moving left to right on the periodic table the atomic radius decreases due to increasing electromagnetic attraction of the nucleus to the electrons.
What happens to the atomic radius when you go from left to right on the periodic table of elements?
The atomic radius decrease, with several exceptions in periods 6 and 5.
What happens to the atomic size of the atoms as you go from left to right of the periodic table?
The atomic radius decrease from left to right in the periodic table.
WHAT BEST STATES THE TREND IN ATOMIC RADIUS ACROSS THE PERIODIC TABLE?
As you move across the periodic table from left to right (across a period), the atomic radius of the elements tends to decrease.
Which of the following decrease as you go from left to right on the periodic table?
The atomic radius decreases as you go from left to right. or atomic radius cation radius && anion radius -barbie=]
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
Does the atomic radius decrease as you move up a group and across a period from left to right on the periodic table?
the atomic radius decreses from left to right in periodic table due to increase in the number of succesive element the electrons of the outermost shell are more attracted towards nucleus and the atomic radius or atomic size decreases.
Electronegativity increases when atoms .?
B. are located on the right on the Periodic TableC. have a small atomic radius
What trend in atomic radii do periods 3 through 6 have in common in the periodic table?
Generally is a decrease of atomic radius along a period, from left to right.
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.
What happens to the atomic radius as you move down the periodic table?
Down a group, the atomic radius increases as the number of shells or energy levels increases.
What happens to the atomic radius when you go from left to right on the periodic table?
As a general rule, when moving left to right on the periodic table the atomic radius decreases due to increasing electromagnetic attraction of the nucleus to the electrons.
