As one moves down the group there is significant jump in the size of the nucleus (Protons (atomic number) + Neutrons). The additions of new shells increases the distance between nucleus and valance electrons. this increases the pull effect of nucleus resulting in the increase in atomic radius of the atom.Also, why does atomic size increase down a group and decrease left to right?
Down a group, atomic radius increases. Atomic radius decreases from left to right within a period. 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.
One may also ask, why do atomic size and ionic size increase as you move down a group? Basically, as we move down the periodic table, the size of the nucleus increases, and concomitantly more electrons are present to "shield" the valence electrons from the charge. If there are many electrons, its harder to rope them up via electron charge than when there are less.
Herein, why does atomic radius increase down a group?
Down a group, the number of energy levels (n) increases, so there is a greater distance between the nucleus and the outermost orbital. This results in a larger atomic radius.
Does atomic size increase left to right?
Moving from left to right across a period, the atomic radius decreases. The nucleus of the atom gains protons moving from left to right, increasing the positive charge of the nucleus and increasing the attractive force of the nucleus upon the electrons.
What is atomic size of an element?
Atomic size is the distance from the nucleus to the valence shell where the valence electrons are located. Atomic size is difficult to measure because it has no definite boundary. The electrons surrounding the nucleus exist in an electron cloud.What do you mean by atomic size?
Atomic size is the distance between a nucleus of an atom and it's valence or outermost shell . Atomic size is a very important characteristic of an atom to understand the reactivity . On this property all other properties can be figure out .What is the most electronegative element?
fluorine
What causes electronegativity?
Electronegativity increases as you move across the periodic table from left to right. This occurs due to a greater charge on the nucleus, causing the electron bonding pairs to be very attracted to atoms placed further right on the periodic table. Fluorine is the most electronegative element.Which element has the highest ionization energy?
Fluorine
What is electron affinity trend?
The electron affinity of an atom or molecule is the propensity for that particle to gain an electron. There are general trends in electron affinity across and down the periodic table of elements. Electron affinity generally increases across a period in the periodic table and sometimes decreases down a group.How is atomic radius determined?
Atomic radius is determined as the distance between the nuclei of two identical atoms bonded together. The atomic radius of atoms generally decreases from left to right across a period. The atomic radius of atoms generally increases from top to bottom within a group.What happens to the atomic size going down a group?
WHY? - The number of energy levels increases as you move down a group as the number of electrons increases. Each subsequent energy level is further from the nucleus than the last. Therefore, the atomic radius increases as the group and energy levels increase.Does shielding increase down a group?
1 Answer. Shielding increases DOWN a Group because the nuclear core is farther removed from the valence electrons.Why does ionic size increase down a group?
As you move down a column or group, the ionic radius increases. This is because each row adds a new electron shell. Ionic radius decreases moving from left to right across a row or period. But for the nonmetallic elements, the ionic radius increases because there are more electrons than protons.What are the elements of trend?
You now understand the three fundamental elements of a trend: basic human needs; change (both longer-term shifts and short term triggers); innovations and can identify points of tension and emerging customer expectations, which are where the key opportunities lie when it comes to consumer trends.What is the trend in ionization energy across a period?
Ionization energy exhibits periodicity on the periodic table. The general trend is for ionization energy to increase moving from left to right across an element period. Moving left to right across a period, atomic radius decreases, so electrons are more attracted to the (closer) nucleus.Why does the atomic size decrease across a period?
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 ionisation decrease down a group?
Going down a group, the ionisation energy decreases. This is due to the shielding or screen effect of the outer electrons from the nucleus and so the attraction is weaker and they are more easily removed.Does electronegativity increase down a group?
So, as you move down a group on the periodic table, the electronegativity of an element decreases because the increased number of energy levels puts the outer electrons very far away from the pull of the nucleus. Electronegativity increases as you move from left to right across a period on the periodic table.Where is the highest electronegativity found?
On the periodic table, electronegativity generally increases as you move from left to right across a period and decreases as you move down a group. As a result, the most electronegative elements are found on the top right of the periodic table, while the least electronegative elements are found on the bottom left.How ions are formed?
Ions are formed when atoms lose or gain electrons in order to fulfill the octet rule and have full outer valence electron shells. When they lose electrons, they become positively charged and are named cations. When they gain electrons, they are negatively charged and are named anions. 
