An atom has the electron configuration of 1s22s22p5 how many electrons are in that atom

There are electrons in this atom.

Explanation:

Electron configuration of this atom: .

The electron orbitals of an atom are denoted as , , , , , etc. At any given time, an electron in this atom is located in exactly one orbital.

The electron configuration of an atom gives the number of electrons in each orbitals of this atom.

For example, in this atom, the superscript "" on the right of "" means that there are two electrons in the orbital of this atom. Hence, would translate to:

Hence, there would be electrons in total in this atom.

108

explanation:

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the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.