# Quick Answer: Which Electron Has The Highest Energy?

## Why is 3rd shell 8 or 18?

The third shell of an atom has 18 electrons only not 8 electrons.

You might be confused because first the electrons of 4s are filled and then the 10 electrons of 3d shells are filled.

They are filled because of the n-l rule.

So after filling the 3s and 3p subshell with 8 electrons, the next shell to fill is the 4s one..

## Are there 7 energy levels?

Thus, the first level can contain up to 2 electrons, 2(12) = 2; the second up to 8 electrons, 2(22) = 8; the third up to 18, 2(32) = 18; and so on. Only seven energy levels are needed to contain all the electrons in an atom of any of those elements now known.

## Does 3p have more energy than 2p?

The 3p is more energetic then the 2p. The energy of orbitals, subshells, and shells, are given as negative numbers—as potential energy. … When vacant of electrons the 4s is lower in energy and the 3d, but as we fill in electrons the 3d becomes less energetic then the 4s. This does not apply, however, to the 2p and 3p.

## Which electron level has the highest energy?

valence electronsThe larger the number of the energy level, the farther it is from the nucleus. Electrons that are in the highest energy level are called valence electrons.

## Which Subshell is higher in energy?

f subshellThese various types of subshells are denoted by the letters s, p, d, and f. Each subshell has a maximum number of electrons which it can hold: s – 2 electrons, p – 6 electrons, d – 10 electrons, and f – 14 electrons. The s subshell is the lowest energy subshell and the f subshell is the highest energy subshell.

## Which Shell has least energy?

K shellThe lowest energy level (the K shell) can only be occupied by two electrons, the L shell by 8 and the M shell by 18. The K shell electrons are closest to the nucleus.

## What happens when an electron absorbs energy?

An atom changes from a ground state to an excited state by taking on energy from its surroundings in a process called absorption. The electron absorbs the energy and jumps to a higher energy level. In the reverse process, emission, the electron returns to the ground state by releasing the extra energy it absorbed.

## What is the 2 8 8 rule in chemistry?

There is a 2-8-8 rule for these elements. The first shell is filled with 2 electrons, the second is filled with 8 electrons, and the third is filled with 8. You can see that sodium (Na) and magnesium (Mg) have a couple of extra electrons. They, like all atoms, want to be happy.

## Is 4s or 3d higher in energy?

The 3d orbitals have a slightly higher energy than the 4s orbitals. So because the 4s orbitals has the lower energy, it gets filled first. When 3d orbitals are filled, 4s is no longer lower in energy.

## What is the highest energy level?

The highest occupied energy level in an atom is the electron-containing main energy level with the highest number.

## How much energy does it take to excite an electron?

For example an electron in the ground state has an energy of -13.6 eV. The second energy level is -3.4 eV. Thus it would take E2 − E1 = -3.4 eV − -13.6 eV = 10.2 eV to excite the electron from the ground state to the first excited state.

## Which orbital is higher in energy 1s or 2s?

An electron in a 1s orbital is of lower energy than one in a 2s orbital because it spends more of its time close to the atomic nucleus.

## Which has the highest energy orbital?

The electrons lost first will come from the highest energy level, furthest from the influence of the nucleus. So the 4s orbital must have a higher energy than the 3d orbitals.

## What is the lowest energy level?

At the lowest energy level, the one closest to the atomic center, there is a single 1s orbital that can hold 2 electrons. At the next energy level, there are four orbitals; a 2s, 2p1, 2p2, and a 2p3. Each of these orbitals can hold 2 electrons, so a total of 8 electrons can be found at this level of energy.

## Why are there 18 electrons in the third shell?

The 3rd subshell consists of an s orbital , a set of (3)p orbitals and a set of (5)d orbitals. Each orbital holds 2 electrons and you will indeed find that you can fir 18 electrons in. … This is because it is the maximum capacity of the 3rd shell and it doesn’t tell about the order in which the electrons are filled.

## Why are shells named KLMN?

The names of the electron shells come from a fellow named Charles G. Barkla, a spectroscopist who studied the X-rays that are emitted by atoms when they are hit with high energy electrons. … This innermost shell is now called the K-shell, after the label used for the X-ray.