On the periodic table, atomic radius generally decreases as you move from left to right across a period (due to increasing nuclear charge) and increases as you move down a group (due to the increasing number of electron shells).
Why does the atomic radius increase down a group?
Ionic Radius and Group
Why does radius increase with higher atomic numbers in a group? As you move down a group in the periodic table, additional layers of electrons are being added, which naturally causes the ionic radius to increase as you move down the periodic table.
Why does atomic radius decrease across a period and increase down a group?
What happens to atomic radii down a Group? Atomic radius decreases across a period because valence electrons are being added to the same energy level at the same time the nucleus is increasing in protons. The increase in nuclear charge attracts the electrons more strongly, pulling them closer to the nucleus.
Why does atomic radius increase from top to bottom?
Answer. This is caused by the increase in the number of protons and electrons across a period. One proton has a greater effect than one electron; thus, electrons are pulled towards the nucleus, resulting in a smaller radius. Atomic radius increases from top to bottom within a group.
Why does reactivity decrease across a period?
Period – reactivity decreases as you go from left to right across a period. The farther to the left and down the periodic chart you go, the easier it is for electrons to be given or taken away, resulting in higher reactivity.
Does atomic radius increase or decrease as you go down a group family on the periodic table?
When moving down a group of the periodic table, the atomic radius increases because of the presence of additional principal energy levels, which are further away from the nucleus.
Why does the atomic radius increase down Group 2?
Progressing down group 2, the atomic radius increases due to the extra shell of electrons for each element. Going down the group, the first ionisation energy decreases.
How does atomic radius change on the periodic table?
Periodic Trends of Atomic Radius
An atom gets larger as the number of electronic shells increase; therefore the radius of atoms increases as you go down a certain group in the periodic table of elements. In general, the size of an atom will decrease as you move from left to the right of a certain period.
How does atomic radius affect reactivity?
The smaller the atomic radius, the more influence the nucleus has on reactivity. Since the nucleus of an atom contains positively charged protons, it also attracts electrons. Halogen atoms already want to gain electrons, so the added force of nuclear pull makes them more reactive.
Does reactivity decrease down a group?
The farther to the left and down the periodic chart you go, the easier it is for electrons to be given or taken away, resulting in higher reactivity. Period – reactivity increases as you go from the left to the right across a period. Group – reactivity decreases as you go down the group.
What is the trend of reactivity?
The reactivity of metals increases further left along a period, and further down a group. On the other hand, reactivity in non-metals increase further right down a period, and further up a group. The most highly reactive element to be observed is cesium, as it spontaneously reacts with air and water!
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