# Short-Questions

Fast solutions for complex problems

28

## How are period and group trends in atomic radii related?

Explanation: Atomic radii DECREASE across a Period, but increase down a Group. On the other hand, as we descend a Group (a column), the filled electron shells effectively shield the nuclear charge. This is why down a Group, the atomic radii INCREASE.

### What is the reason for the atomic radii trend across the periods?

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.

#### What is the general trend for atomic radius left to right across the periodic table and why?

Across a raw in the periodic table (or a period), from left to right the size of atoms decreases. The reason is that the effective nuclear charge increases due to the increase in the atomic number and therefore, the attraction toward the nucleus will be important and therefore, the size will be smaller.

What is the trend for atomic radius as you go down group 1?

Atomic radius increases as you go down the Group 1 elements from top to bottom as an additional energy level (electron shell) is being added to each successive element.

Why does atomic size 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.

## What element in the second period has the largest atomic radius?

Answer: In the second period of modern periodic table Lithium (Li) is the element with largest atomic radius.

### What is the trend in EA across a period?

Electron affinity generally increases across a period in the periodic table and sometimes decreases down a group. These trends are not necessarily universal. The chemical rationale for changes in electron affinity across the periodic table is the increased effective nuclear charge across a period and up a group.

#### What is the general trend for atomic radius as you move across a row?

In general, atomic radius decreases across a period and increases down a group. Across a period, effective nuclear charge increases as electron shielding remains constant.

Which element has the largest atomic radius in group 1?

Trends in Atomic Radius of Group 1 Elements

sodium 186
potassium 425
rubidium 244
caesium 262 largest

Does atomic size increase across a period?

In general, atomic radius decreases across a period and increases down a group. A higher effective nuclear charge causes greater attractions to the electrons, pulling the electron cloud closer to the nucleus which results in a smaller atomic radius.

## Why do both atomic size and ionic size increase as you move 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. While the atomic radius follows a similar trend, ions may be larger or smaller than neutral atoms.

### Which period has the largest radius?

This question is about trends in the Period 2 elements from lithium to nitrogen. But the atom with the largest atomic radius is referred to as Cesium. We have shown the Atomic Radius of the elements for which reliable data is available. Lawrencium has the largest atomic radius.

The atomic radius increases as one goes down a group in the periodic table because more electrons are around the atom and more neutons and protons are present. As one goes across a period the atomic radius decreases because more protons are in the atoms as one goes across the period and the electrons are in the same shell.

Which elements have the highest atomic radius?

The element that has the largest atomic radius is cesium. It has an atomic radius of 298 pm, or picometers.The atomic number of cesium is 55.

Which periodic group has the smallest atomic radius?

The element that has the smallest atomic radius is TITANIUM. In the periodic table, the value of atomic radii of elements varies across the period and down the group. Generally, the atomic radii decreases across the period and increases down the group.

## What trend does the atomic radius follow?

Both atomic radius and ionic radius follow a trend on the periodic table. The radius increases as you move down a group (column) and decreases as you move from left to right across a period (row).