# When two atoms have the same atomic number they have the same number of?

isotopes

## What do all atoms of the same element have the same?

All atoms of an element have the same number of protons, and every element has a different number of protons in its atoms.

## Why do all atoms of an element have the same atomic number?

In a neutral atom, the number of electrons is equal to number of protons. The number of electrons and protons doesn’t change for any element, but the number of neutrons can be varied. Therefore, all atoms of an element have the same atomic number; even they can have different mass numbers.

## Can two elements have the same atomic number?

Atomic number is the number of protons in the nuclei of an element. Since no two element can have same number of protons, thus atomic number cannot be same and also atomic number can also be called an unique ID of an element.

## What is the atomic number equal to?

The atomic number or proton number (symbol Z) of a chemical element is the number of protons found in the nucleus of every atom of that element. It is identical to the charge number of the nucleus. In an uncharged atom, the atomic number is also equal to the number of electrons.

## Are atoms mostly empty space?

Atoms are not mostly empty space because there is no such thing as purely empty space. Atoms are filled with electrons. It’s true that a large percentage of the atom’s mass is concentrated in its tiny nucleus, but that does not imply that the rest of the atom is empty.

## Why can’t we walk through walls?

You simply can’t walk through walls. Because according to the Pauli Exclusion Principle, no two particles can exist in the same place – it’s just impossible for both the particles — within the limits set by the uncertainty principle — to have the same position and same velocity.

## Do we ever really touch anything?

You don’t actually “touch” anything at any level. When we “touch” something, the atoms of our fingertips approach the atoms of the surface we’re “touching”, at which point atomic forces prevent any closer proximity. The resistance we feel is actually mutual atomic repulsion from a distance.

## How long will the universe live?

It is expected that between 1011 (100 billion) and 1012 (1 trillion) years from now, their orbits will decay and the entire Local Group will merge into one large galaxy.

## What is atomic number equal to?

Atomic number, the number of a chemical element in the periodic system, whereby the elements are arranged in order of increasing number of protons in the nucleus. Accordingly, the number of protons, which is always equal to the number of electrons in the neutral atom, is also the atomic number.

Electrons

## Which is the smallest mass?

Answer and Explanation: Of the three subatomic particles, the electron has the smallest mass. The mass of an electron is 1/1840 of an atomic mass unit (amu).

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