# How many electrons will go in the first shell of sodium?

So for the element of SODIUM, you already know that the atomic number tells you the number of electrons. That means there are 11 electrons in a sodium atom. Looking at the picture, you can see there are two electrons in shell one, eight in shell two, and only one in shell three.

11 electrons

Secondly, how many electrons does sodium atomic number 11 need to lose to be full? If sodium (group 1) loses 1 electron, it gets a full outer shell. Because the sodium ion then has 11 protons but only 10 electrons, it gains a posi)ve charge of +1. Calcium, the next atom along, needs to lose 2 electrons to get a full outer shell, giving it a charge of +2.

Keeping this in view, how many electrons are in a shell?

Each shell can contain only a fixed number of electrons: The first shell can hold up to two electrons, the second shell can hold up to eight (2 + 6) electrons, the third shell can hold up to 18 (2 + 6 + 10) and so on. The general formula is that the nth shell can in principle hold up to 2(n2) electrons.

How many orbitals are in sodium?

When we write the configuration we’ll put all 11 electrons in orbitals around the nucleus of the Sodium atom.

### Why are there only 2 electrons in the first shell?

This first shell has only one subshell (labeled 1s) and can hold a maximum of 2 electrons. This is why there are two elements in the first row of the periodic table (H & He). Because the first shell can only hold a maximum of 2 electrons, the third electron must go into the second shell.

### How is Valency calculated?

The valency of an atom is equal to the number of electrons in the outer shell if that number is four or less. Otherwise, the valency is equal to eight minus the number of electrons in the outer shell. Once you know the number of electrons, you can easily calculate the valency.

### What is a Subshell?

A subshell is a subdivision of electron shells separated by electron orbitals. Subshells are labelled s, p, d, and f in an electron configuration.

### How many electrons does the 4th Shell hold?

The fourth energy level has 18 electrons. The fourth energy level of the periodic table includes the 4s 3d and 4p orbitals. The 4p orbital holds 6 electrons.

### How many electrons are in Na+?

An Na+ ion is a sodium atom that has lost one electron as that makes the number of electrons in the atom equal to that of the nearest Nobel gas Neon which has 10 electrons. This completely fills the 1st and 2nd electron shells. The sodium atom has 11 protons, 11 electrons and 12 neutrons.

five

### How many electrons can 5f hold?

Each orbital can hold two electrons, so the capacity of an nf subshell is 14 electrons.

### How many electrons can the 7th Shell hold?

Notice that you can easily find the number of electrons that an atom can accomodate on a particular shell, or energy level, by using the fact that each orbital can hold a maximum of two electrons.

### What do electrons in the same shell have in common?

What do electrons in the same shell have in common? They have the same amount of energy.

### Why do shells start with K?

He noticed that atoms appeared to emit two types of X-rays. As it turns out, the K type X-ray is the highest energy X-ray an atom can emit. It is produced when an electron in the innermost shell is knocked free and then recaptured. This innermost shell is now called the K-shell, after the label used for the X-ray.

### How do you find the electrons?

The number of protons, neutrons, and electrons in an atom can be determined from a set of simple rules. The number of protons in the nucleus of the atom is equal to the atomic number (Z). The number of electrons in a neutral atom is equal to the number of protons.

### What do you mean by valence shell?

Definition of valence shell. : the outermost shell of an atom containing the valence electrons.