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Because there are increasingly more protons, electrons, and neutrons. Atomic Mass is the average number of neutrons in all of the isotopes(different types) of a specific element, meaning you can sometimes have decimal masses. But, the atomic number is never a decimal because the atomic number is just a numbering system for all the elements.

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Q: Why does the atomic mass on the periodic table progressively changes left to right and top to bottom why?
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What happens to the atomic size from the top to the bottom of the periodic table?

The atomic size increase from top to bottom of periodic table. As the number of shells increases from top to bottom, the atomic size increases.


What happen to the atomic as you from the bottom to the top of the periodic table?

From the bottom to the top, the elements of the atomic periodic table have less mass and are more stable, in general.


What happens to the atomic radius as you from the bottom to the top of the periodic table?

The atomic radius decreases.


What happen to the atomic radius as move from the bottom to the top of the periodic table?

The atomic radius decreases.


Where on the periodic table are elements which the highest atomic mass?

The elements with the highest mass are on the bottom right of the periodic table.

Related questions

What happens to the atomic size from the top of the periodic table to the bottom?

The atomic size increase from top to bottom of Periodic Table. As the number of shells increases from top to bottom, the atomic size increases.


What happens to the atomic size from the top to the bottom of the periodic table?

The atomic size increase from top to bottom of periodic table. As the number of shells increases from top to bottom, the atomic size increases.


What happen to the atomic as you from the bottom to the top of the periodic table?

From the bottom to the top, the elements of the atomic periodic table have less mass and are more stable, in general.


What happens to the atomic radius as you from the bottom to the top of the periodic table?

The atomic radius decreases.


Towards the bottom of the periodic table does the atomic mass increase or decrease?

Towards the bottom, atomic mass increases. Atomic number also increases.


What happen to the atomic radius as move from the bottom to the top of the periodic table?

The atomic radius decreases.


Where would the atomic number 113 go in the periodic table?

on the bottom


What is the meaning of the number printed at the bottom of the periodic table?

The atomic mass.


Where are the antinides on the periodic table?

Actinides comprise of atomic number 90-103. They are placed at bottom of periodic table.


Where on the periodic table are elements which the highest atomic mass?

The elements with the highest mass are on the bottom right of the periodic table.


. How does atomic radius change from top to bottom in a group in the periodic table?

It tends to increaseThe atomic radius increases down the group


Which elements on the periodic table have the lowest electronegativity?

Atoms to the left on the periodic table Atoms with a large atomic radius