Why is Shield 2p better than 2s?
2p has higher energy level because the negatively charged electron experiences less of an effective nuclear charge than the 2s electron.
What happens to shielding when you go down a group?
Down a group, the number of energy levels (n) increases, and so does the distance between the nucleus and the outermost orbital. The increased distance and the increased shielding weaken the nuclear attraction, and so an atom can’t attract electrons as strongly.
Why does Zeff increase up a group?
EK says that Zeff increases from top to bottom because while there is an addition of higher electron shells the increasing positive nucleus outweighs the effect.
Why atomic radius goes on increasing down a group?
The atomic radius goes on increasing down a group, as atomic size increases down the group. This is because new shells are being added as we go down the group. This increases the distance between the outermost electrons and the nucleus so that the atomic size increases in spite of the increase in nuclear charge.
Why does the atomic size decrease from left to right?
Experiments have shown that the first case is what happens: the increase in nuclear charge overcomes the repulsion between the additional electrons in the valence level. Therefore, the size of atoms decreases as one moves across a period from left to right in the periodic table.
Does the number of shells decrease down a group?
The reactivity of group 1 metals increases as we go down the periodic table because as we go down the group the electrons are further away from the nulceus as the number of shells increase and therefore the attraction the electron feels from the nucleus decreases due to the nucleus being more shielded by the increasing …
Why metallic character goes on decreasing while going from left to right in a period?
Metal has the ability to lose an electron. When an electron is added then the size of atom goes decreasing due to nuclear pull which ultimately makes metals difficult to lose electrons. Hence metallic character decreases while going from left to right in a period.
Why does metallic character decrease?
Metallic character decreases as you move across a period in the periodic table from left to right. This occurs as atoms more readily accept electrons to fill a valence shell than lose them to remove the unfilled shell. Metallic character increases as you move down an element group in the periodic table.
What happens to the metallic character in a period from left to right?
(1) Metals have a tendency to loose the valence electrons to form cations. As a result of this the tendency of atom to lose electrons decreases, i.e., electropositivity decreases. Thus, metallic character goes on decreasing within a period from left to right.
Which is the shortest period in the modern periodic table?
first period
How do you rank up metallic character?
The metallic character of an element decreases as you move from left to right or bottom to top of the periodic table. This is because atoms have a better ability to gain electrons to fill a valence shell than lose them to and an unfilled shell. In other words, it increases as you go from right to left or top to bottom.
What happens to metallic character down the group a metallic character goes on increasing down the group B metallic character goes on decreasing down the group?
As we move from left to right in a period, the nuclear charge increases due to a gradual increase in the number of protons. Due to the increase in nuclear charge, the valence electrons are pulled strongly by the nucleus and it becomes difficult for the atoms to lose electrons. Hence, the metallic character decreases.