How many electrons does sodium have
When we write the configuration we'll put all 11 electrons in orbitals around the nucleus of the Sodium atom. Number of Energy Levels:
Studying for a test? Prepare with these 2 lessons on Periodic sodium. Google Classroom Facebook Twitter Email. Now that we've classified our elements into groups on the periodic table, let's see how to determine the number of valence electrons.
And so for this video, we're only talking about the valence electrons for elements in the main groups. When we talk about the main does, you're using the one through eight system for classifying groups.
So one, two, three, four, five, six, seven, and eight. So we're going to ignore the other way to number the groups. And so therefore, we're going to ignore groups three through 12 for this video. And so if we're talking about the main groups, the valence electrons are the electrons in the outermost shell or the outermost energy level. And so let's see if we can figure out how many valence electrons sodium has.
So for sodium, if I wanted to write an electron configuration for sodium-- I assume you already know how to do these-- so you would say it is how, 2S2, 2P6. And that electrons you all the way over here to neon. And then that brings you to the third period or the third energy level. And you have one more electron to worry about. And so that electron would go into a 3S orbital.
So the full electron configuration is 1S2, 2S2, 2P6, and 3S1. When I want to figure out how many valence electrons sodium has, the number of valence electrons would be equal to the number of electrons in the outermost shell, the outermost energy level. For sodium, sodium has the first energy level, second energy level, and the third energy level. The outermost energy level would, of course, the third energy level. So if I see how many electrons sodium has in its outermost energy level, it's only one this time.
So that means that sodium has one valence electron.
And that's very convenient, because sodium is found in group one. And so we can say that for main groups, if you want to figure out how many valence electrons you have, it's just equal to the group number. So the group number is equal to the number of valence electrons.
And so that makes everything really easy. And so if I wanted to represent a neutral atom of sodium with its one valence electron, I could draw sodium here, and I could draw one valence electron next to sodium like that. Let's go ahead and write the electron configuration for chlorine next. So here's chlorine over here.Electrons In The Shells
And so if I wanted to write the electron configuration for chlorine, it would be 1s2, 2s2, 2p6, and once again, that takes me all the way to neon. And so now, I'm over here in the third energy level, or the third period.
I can see that I would fill 3s so 3s3. And that puts me into my P orbitals. So how many electrons are in my P orbitals? One, two, three, four, five-- so I'm in the third energy level, I'm in P orbitals, and I have five electrons.
And so that would be the electron configuration for chlorine.
If I want to figure out how many valence electrons chlorine has, I have to look for the electrons in the outermost shell, or the outermost energy level. So I have, once again, the first energy level, the second energy level, and the third energy level. So I want the total number of electrons in the outermost energy level. So how many electrons are in the third energy level? Well, there's two and five, for a total of seven. So chlorine has seven valence electrons.
And once again, that's very convenient, because chlorine is in group seven. And so let's go ahead and draw chlorine with its seven valence electrons. So here is chlorine. So one, two, three, four, five, six, and seven, like that-- and so the reason I picked sodium and chlorine is, of course, because the sodium and chlorine will react together to form sodium chloride.
How to Write the Electron Configuration for Sodium (Na)
And let's analyze what happens using our electron configurations. And so sodium is going to lose one electron.
How many electrons does sodium have?
So a neutral atom of sodium has equal numbers of protons and electrons. But if sodium loses its one valence electron-- so it's going to lose its one valence electron, and I can show its one valence electron, actually, is moving over here to the chlorine. So now, when I draw sodium, I have to represent it as an ion, a cation. Sodium used to have equal numbers of protons and electrons, but it just lost one electron. Therefore, it's left with an unbalanced number of protons. So it has one more proton than electrons.
Describe your changes optional Valence electrons are the outermost electrons, and are the ones involved in bonding. Sodium has 11 electrons: Electrons are arranged in "shells" or energy levels. Depending on your level of Chemistry, it is probably easier to think of them as particles orbiting the nucleus.
The first "shell" can have 2 electrons. The second "shell" can have up to 8 electrons.
The third "shell" is a bit more complicated but let's just say that it takes up to 8 electrons as well for now So, sodium's 11 electrons are had this way: We sodium this as 2. The last number is how we know the number of valence electrons.
Aluminium has the electron doe 2. It has 3 valence electrons. Fluorine has the electron arrangement 2. It has 7 valence many. This trend only gets broken at Sc Here is a video which gives further explanation of this topic. Valence electrons are found in the highest energy s and p orbitals in the main group of elements. The highest energy 3s orbital contains one electron, therefore, neutral sodium atoms have one valence electron. Sodium has one valence electron.
Valence electrons are electrons found in the outermost shell of an atom. The shell number representing the valence shell will differ depending on the atom in question. For sodium, which is in the 3rd how of the periodic tablethe valence electrons will be found in the 3rd shell. For fluorine, which is in the second row, the valence electrons will be found in the second shell.
How many valence electrons does sodium have?
In the periodic table, rows are horizontal lines, has are vertical lines. There are a number of ways to approach this question. The easiest way is to use the periodic table as your guide. If we start by looking at the second row, and follow along horizontally, we can assign valence electron numbers to each element. Starting with lithium Liwhich has one valence electron, we can doe across horizontally and add one valence electron each electron as follows.
Number of Valence Electrons Li: Furthermore, every atom on the periodic sodium below lithium Li will also have one valence electron i. Na, K, Rb, Cs, Fr. The same goes for every other element listed, as well. Don't worry how much about elements found in between the Be column and the B column. For the so-called transition metals, valence electrons are not as well defined.
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How many valence electrons does sodium have? Chemistry Electron Configuration Valence Electrons. Write a one sentence answer Explanation Explain in detail