ground

What happens when a hydrogen atom absorbs a quantum of energy? When an atom absorbs a quantum energy, it movies to the excited state, and electrons move to higher energy levels. One it is done, it goes back down to ground state and release the energy via light.

When an atom is in an excited state, the electron can drop all the way to the ground state in one go, or stop on the way in an intermediate level. Electrons do not stay in excited states for very long – they soon return to their ground states, emitting a photon with the same energy as the one that was absorbed.

No two elements have the same ground-state electron configuration.

In order for an electron to be ejected from a metal surface, the electron must be struck by a photon with at least the minimum energy needed to knock the electron loose. The ground state is the lowest energy state of the atom. When the atom absorbs energy, it can move to a higher energy state, or excited state.

The ground state configuration is the lowest energy, most stable arrangement. An excited state configuration is a higher energy arrangement (it requires energy input to create an excited state). Valence electrons are the electrons utilised for bonding.

Electron and atom diffraction Experiments proved atomic particles act just like waves. The energy of the electron is deposited at a point, just as if it was a particle. So while the electron propagates through space like a wave, it interacts at a point like a particle. This is known as wave-particle duality.

The excited state electron configuration shows when an electron is excited and jumps into a higher orbital. For example, sodium in its excited state would have an electron configuration of 1s2 2s2 2p6 3p1, compared with its ground state of 1s2 2s2 2p6 3s1.

Electron Configurations

When an electron temporarily occupies an energy state greater than its ground state, it is in an excited state. An electron can become excited if it is given extra energy, such as if it absorbs a photon, or packet, of light, or collides with a nearby atom or particle.

Accordingly, what is the electron configuration of mg2+? The p orbital can hold up to six electrons. We’ll put six in the 2p orbital and then put the remaining two electrons in the 3s. Therefore the Magnesium electron configuration will be 1s22s22p63s2.

The enclosed electron configuration is the electron configuration of Neon (Ne), the nearest noble gas to Mg. Therefore, the correct noble gas electron configuration of Mg2+ is B. [Ne].

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Sr2+ has an electron configuration of 1s22s22p63s23p64s23d104p6.

The electron configuration of Br- is [Ar] 3d10 4s2 4p6.

two electrons

Strontium ion (Sr2+) 38 protons 36 electrons 29.

Explanation: Strontium will lose the two outer valance electrons to form a stable noble gas electron structure. As electrons are negative losing two negative electrons will leave Strontium with a +2 charge.

Strontium is the chemical element with the symbol Sr and atomic number 38.

Strontium

On the periodic table of elements, oxygen is represented by the symbol O. It has an atomic number of 8 because it has 8 protons in its nucleus.

Thus, a magnesium atom will form a cation with two fewer electrons than protons and a charge of 2+. The symbol for the ion is Mg2+, and it is called a magnesium ion. Nitrogen’s position in the periodic table (group 15) reveals that it is a nonmetal. Nonmetals form negative ions (anions).

Chemical formulae of ions