What is the number of lone pairs of electrons for element N 20

The atomic number of n is 7, there are 7 electrons outside the nucleus, and the electronic configuration is 1s2 2s2 2p3.

The first layer has 2 electrons and is a pair of electrons; The second layer is lined with 5 electrons and has one paired electron and three single electrons, and the nitrogen atom has two paired electrons and three single electrons. See the image below:

The atomic number of n is 7, there are 7 electrons outside the nucleus, and the first shell is lined with 2 electrons, which is a pair of electrons; The second layer is lined with 5 electrons and has one paired electron and three single electrons, and the nitrogen atom has two paired electrons and three single electrons.

Generally what we are talking about are the outermost electrons, n outermost shell has a pair of electrons and three single electrons, when NH3 is formed, each hydrogen atom provides one electron and the three single electrons of the nitrogen atom form three covalent bonds, that is, NH3 molecule, there is only one lone pair of electrons.

The right here is well, I think you're probably misunderstood, and the pair here is one to put it bluntly, that is, three lone pairs of electrons, n five electrons outside the nucleus, you know, the electrons repel each other, and in order to stay as far away as possible, you imagine that they are distributed around the nucleus, so that there is one more on the top and bottom, one on the left and right, and one more, and there is no way to have two on one side, so it is paired, so there are three lone pairs of electrons left (even if you think you should be a junior high school student, just know so much, hehe, I'm a freshman, studying chemistry education).

And in NH3, it's different, where the pair (in fact, everyone is used to calling it a "pair", but it is more reasonable to call it a single electron) is two, but the principle is the same, n has three separate (single) electrons, and they are the same as the one electron of the h atom. Well.. Pairing, so that n, the two electrons that are teamed up by themselves are also called lone pairs, as for the last question.

Can add a little more points not o( o haha

There are two electron shells outside the nucleus, and the first electron shell can only hold two electrons, and the second electron shell holds the remaining three electrons, which are the three single electrons, because there are only two shells, and when they are paired, they become the outermost lone pairs.

Got it? I've tried to be as vivid as I can.

There are 7 protons, 7 neutrons, and 7 extranuclear electrons inside the nitrogen atom.

The outer electron configuration of the nucleus is , and the 2 of the inner shell is a stable structure and is not electrically significant.

The second layer is divided into four orbitals, and 2 electrons can be placed in each orbital (these two electrons move in opposite directions, so there is no restriction on electricity). The arrangement of electrons outside the nucleus is that the empty orbital sends the empty orbital first and then pairs.

There are 5 electrons in the outer shell of the nitrogen atom, the first four have an orbital, the fifth one is paired with one of them, and the other three are lone pairs, so there are 3.

It's 3 pairs, there are 5 valence electrons, distributed in the four directions of n, up, down, left and right, and one side has two, so there are 3 lone pairs of electrons.

A lone electron pair is a valence electron pair in the valence electrons that is not involved in the formation of chemical bonds.

Lone pairs refer to electrons that are not involved in bonding and are not participating in bonding. h, such as ammonia h:n:

h does not form a covalent bond only the two on the far right, which is a pair.