## Why does the atomic radius decrease across a period 3?

Moving across Period 3, the number of protons in the nucleus increases – for example sodium has 11 protons, and chlorine has 17 protons. Nuclear charge increases across the period, therefore the attraction between the positively charged nucleus and negatively charged electrons increases, so the atomic radii decreases.

## Why does the atomic radius decrease as the atomic number increases?

Remember that as atomic numbers increase, the number of protons increase as well in the nucleus. This concentration of positive charge in the middle of an atom makes all the electrons come closer to the nucleus. Thus, the radius of the atom decreases because the electron cloud is less spread out.

## Why does atomic size tend to decrease with increasing atomic number across a row of the periodic table?

Terms in this set (11) Why does atomic size tend to decrease with increasing atomic number across a row of the periodic table? The atoms have increasing effective nuclear charge.

## What is the trend in atomic radius across Period 3?

What is the trend in atomic radius of the elements across Period 3 and why does this occur? The atomic radius of the elements decreases from sodium to argon. This is because the number of protons increases (sodium has 11, argon has 18) so the nuclear charge increases.

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

Considering this trend Sodium is having a highest atomic radius in 3rd period.

## Does atomic radius 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.

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## Does atomic radius increase with atomic mass?

1 Answer. The atomic number is the amount of protons present in the atom. Because of that, we can say that the atomic number represents the positive charge of the atom. As the positive charge of the atom increases the atomic radius decreases because the positive charge will bring electrons closer to the nucleus.

## Does atomic size increase with atomic number?

Atomic size is a periodic trend, meaning that it repeats in a regular pattern. Going from left to right across a period (horizontal row) of the periodic table the atomic radius or size decreases as the atomic number increases.

## Which element in Group 2 has the largest atomic radius?

Trends in Atomic Radius of Group 2 Elements

magnesium 160
calcium 197
strontium 215
barium 217 largest

## Why a higher energy is needed to remove the fourth electron?

Because carbon and nitrogen have four and five valence electrons, respectively, their fourth ionization energies correspond to removing an electron from a partially filled valence shell. This should require much more energy. The actual values are as follows: B, 25,026 kJ/mol; C, 6223 kJ/mol; and N, 7475 kJ/mol.

## Does atomic radius increase or decrease as you go across a period row on the periodic table?

Atomic radii vary in a predictable manner across the periodic table. Radii generally decrease along each period ( row ) of the table from left to right and increase down each group (column).

## Which is the correct order of melting points of these Period 3 elements?

Melting Point of Period 3 Elements

• Melting point increases for metals Na, Mg and Al.
• High melting point for Si.
• Melting point for non-metals decrease in order S8, P4, Cl.
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## What are 3 elements in the same period?

The third period contains eight elements: sodium, magnesium, aluminium, silicon, phosphorus, sulfur, chlorine, and argon. The first two, sodium and magnesium, are members of the s-block of the periodic table, while the others are members of the p -block. Period 3 element.

Hydrogen Rubidium Strontium Yttrium Zirconium Niobium

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## What happens to the atomic radius as you move across a period from left to right?

Periodic Trend The atomic radius of atoms generally decreases from left to right across a period. Within a period, protons are added to the nucleus as electrons are being added to the same principal energy level. These electrons are gradually pulled closer to the nucleus because of its increased positive charge.