How do you explain atomic size?

How do you explain atomic size?

Atomic size is the distance between the centre of the nucleus of an atom and its outermost shell. In basic chemistry, the atomic radius is defined as the shortest distance between the atom’s nuclei and the outermost shell of the atom.

What are the two main causes of the atomic size trend?

These factors are: the number of protons in the nucleus (called the nuclear charge). the number of energy levels holding electrons and the number of electrons in the outer energy level. the number of electrons held between the nucleus and its outermost electrons (called the shielding effect).

Why does 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.

What is the trend of atomic size on the periodic table?

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.

How does atomic size change in a group?

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.

How does atomic size vary on the periodic table?

Atomic size decreases across a Period from left to right as we face the Table, but INCREASES down a Group, a column of the Periodic Table. Atomic size is influenced by (i) nuclear charge, Z , and by (ii) shielding by other electrons.

How does the atomic size vary?

In general, the atomic radius decreases as we move from left to right in a period with an increase in the nuclear charge of the element. The atomic radius increases when we go down a group because of the addition of an extra shell.

What are trends among the elements for atomic size?

Atomic radius patterns are observed throughout the periodic table. Atomic size gradually decreases from left to right across a period of elements. This is because, within a period or family of elements, all electrons are added to the same shell . However, at the same time, protons are being added to the nucleus, making it more positively charged.

What is the size of an atom trend?

The other trend of atomic radius or atom size occurs as you move vertically down an element group. This direction increases the size of the atom. Again, this is due to the effective charge at the nucleus. This time, even though the number of protons increases by a lot, the electron valence shells do not.

What is the trend on the periodic table for atomic size?

Atomic Radius Trend on the Periodic Table. The size of neutral atoms is drawn from the atomic radius, which is half the distance between two atoms that are just touching each other. If you look at the table, you can see there is a clear trend in atomic radius. Atomic radius is one of the ​periodic properties of the elements.

When does atomic size increase?

Answer: Atomic size increases with increase in period number.(as we move from above to below in a group ) Atomic size decreases as we move from left to right in a period . Explanation: As period number increases , number of shells increase , so atomic size increases .