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Why does the atomic radius decrease when moving across the periodic table?
Wiki User
∙ 11y ago
It decreases because there is an increase in positive charge in the nucleus as you go from left-to-right. Each time you go over an element it has one more electron and proton added to the principal energy level, so the nucleus pull increases and it holds the valence electron in tighter.
Wiki User
∙ 16y ago
Wiki User
∙ 13y agoAtomic radius decreases because you are adding protons to the nucleus as you move from the left to the right of the period. These additional protons pull with more force on the electrons outside the nucleus, drawing them all in closer, and making the radius of the atom smaller.
Wiki User
∙ 13y agoAtomic radius is distance from centre of nucleus to the outer most shell of electrons of an atom.
As we go along a period the number of electron shells remain same. But the number of electrons in last shell as well protons in nucleus increase so the outer shell electrons are attracted by an increased amount of electrostatic force( as per coulomb's law) towards nucleus. So the outer shell electrons get closer to nucleus and atomic radius decreases.
Wiki User
∙ 11y agoThe atomic radius actually decreases even as atomic number and mass increase as you go left to right across a period. This is because as you move left to right, you add valence electrons, which are the electrons in the outermost energy level of the atom. The positively charged nucleus of the atom interacts more strongly the more outer-level electrons there are (because oppositely charged bodies attact each other.) This binds the atom closer together, actually making the overall volume of the atom smaller, even though the mass, and therefore the density of that atom, increases. Most periodic trends are caused at least in part by the attraction between nucleus and electrons.
Wiki User
∙ 6y agoAtomic radius (size) decreases within a period going from left to right because within a period, all the elements have the same number of energy levels. Thus, the valence electrons are all within the same energy level meaning the same distance from the nucleus. However, as you move left to right, the number of protons in the nucleus increases, thus exerting a greater pull on those electrons. This results in a smaller radius.
Wiki User
∙ 11y agoAcross a period, the effective nuclear charge increases. so size decreases.
Wiki User
∙ 13y agoAtomic radius decreases due to increase in effective nuclear charge.
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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 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.
Moving across a period on the periodic table from left to right?
ionization energy
Is it true Moving across a row of the periodic table the atoms tend to get bigger?
yes
What happens to conductivity when moving across periodic table?
metal--> nonmetal --> metalloid
When moving across a period in the periodic table?
The atomic number increases
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.
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
How do atomic radii change from left to right across a horizontal row of the periodic table and what is the main reason?
Atomic radii decreases on moving from left to right as the effective nuclear charge increases.
Does the atomic number increase when moving left to rt on periodic table?
Yes.
An increase in the atomic number the atomic radius moving from left to right across a period.?
decreases
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.
Moving across a period on the periodic table from left to right?
ionization energy
What happens to the reactivity of elements in groups as the atomic numbers increase across a period?
they become more reactive since you are moving from left to right on the Periodic Table, the elements in group 17 are the most reactive.
Does atomic density increase or decrease as we go across in a period?
It decreases across a period. Since the atomic number increases, so does no. of protons and electrons. This makes the electrostatic force of attraction between electrons larger and hence the atom shrinks a bit. This makes the radius smaller.
Is it true Moving across a row of the periodic table the atoms tend to get bigger?
yes
