# What causes the atomic number to increase but the atomic mass number to stay the same?

## What causes the atomic number to increase but the atomic mass number to stay the same?

A beta particle forms when a neutron changes into a proton and a high-energy electron . When a nucleus emits a beta particle, these changes happen: the mass number stays the same. the atomic number increases by 1.

Does increasing atomic number always increase atomic mass?

The atomic number is what the periodic table is based on. So the atomic number increases with each element. The atomic mass is the sum of the protons and neutrons. As the atomic number increases it causes an increase in the atomic mass.

### What happens to the atomic mass when the atomic numbers increase?

As you move across a period, the atomic mass increases because the atomic number also increases. When the atomic number increases, this means that there are more protons and neutrons that add to the atomic mass of an atom. The atomic mass for any given atom mainly comes from the mass of the protons and neutrons.

Why does atomic mass stay the same?

For isotopes (elements that have different masses, no charge), only the number of neutrons has been changed. Because none of these situations change the number of protons, the atomic number stays the same regardless.

## Why do atomic numbers increase?

Moving Across the Periodic Table. an increase in atomic size because of additional repulsions between electrons, a decrease in size because of the additional protons in the nucleus, no effect at all as the two opposing tendencies of electron repulsion and nuclear attraction balance each other out.

How is it possible that the atomic number increases in number yet the atomic masses do not increase as regularly?

The reason increasing atomic number doesn’t always equate to increasing mass is because many atoms don’t have the same number of neutrons and protons. In other words, several isotopes of an element may exist.

### Is atomic mass and mass number same?

Atomic mass is the weighted average mass of an atom of an element based on the relative natural abundance of that element’s isotopes. The mass number is a count of the total number of protons and neutrons in an atom’s nucleus.

What happens as the number of protons increases?

The more protons in the nucleus, the stronger the attraction of the nucleus to electrons. In this situation, the first electron removed is farther from the nucleus as the atomic number (number of protons) increases. Being farther away from the positive attraction makes it easier for that electron to be pulled off.

## Why does atomic mass increase?

Explanation: As you go from left to right in the Periodic Table, you are adding more protons and neutrons to the nuclei. Therefore, atomic mass increases from left to right and from top to bottom of the Periodic Table.

Why does atomic radius increase as the atomic number increases?

This is because atomic number increases down a group, and thus there is an increased distance between the valence electrons and nucleus, or a greater atomic radius.

### Why does atomic size increase with atomic number within a group but decrease with atomic number within a period?

Atomic radius becomes smaller as you move across a row/period of the periodic table because it increases the number of protons, But, the Atomic radius becomes larger as you move down the periodic table in a group or column because it increases the number of energy levels.

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