# Why Does Calcium Only Have 8 Electrons In The Third Shell?

## How many electrons can you have in the 3rd shell?

eight electronsThe second shell can hold a maximum of eight electrons.

When this is filled, electrons go into the third shell, which also holds a maximum of eight electrons….Electron shells.Energy shellMaximum number of electronsFirst2Second8Third8.

## Why does scandium have 9 electrons in the third shell?

Scandium is the first element of the period table where electron configurations start getting a little wild. … Every element adds one more electron to the outermost shell. Instead of having three electrons in the outer shell, scandium adds its electron to the second to last shell. The electron configuration is 2-8-9-2.

## Why are shells named KLMN?

The names of the electron shells come from a fellow named Charles G. Barkla, a spectroscopist who studied the X-rays that are emitted by atoms when they are hit with high energy electrons. He noticed that atoms appeared to emit two types of X-rays.

## Why do atoms want 8 electrons?

A complete octet is very stable because all orbitals will be full. Atoms with greater stability have less energy, so a reaction that increases the stability of the atoms will release energy in the form of heat or light. A stable arrangement is attended when the atom is surrounded by eight electrons.

## Why is the third period contains 8 elements and not 18?

According to the 2n2 rule, the maximum number of electrons in the third period = 2 x (3)2 = 18. But, the last shell cannot accommodate more than 8 electrons so, the number of electrons in third period is 8. Hence, the number of elements is also 8.

## What is KLMN shell?

The KLMN(OP) method is based on electron shells, with the labels KLMN(OP) being derived from an experiment in which the spectroscopist wanted to leave room for lower energy transitions in case there were any. K denotes the first shell (or energy level), L the second shell, M, the third shell, and so on.

## Why does the third period contain 8 elements?

The third period contains only eight elements even though the electron capacity of the third shell is 18 because when the other shells get filled and the resultant number of electrons becomes eighteen, it gets added up and settles in the third electron shell and three shells are acquired by the fourth period.

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

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.

## Why does the third shell have 8 electrons?

There are certain rules for arranging atoms in shells 1) Maximum number of electrons in a shell is given by the formula 2n^2. 2) The outermost ( valence) shell can accomodate only 8 electrons.

## Is the third shell 8 or 18?

The third shell of an atom has 18 electrons only not 8 electrons. You might be confused because first the electrons of 4s are filled and then the 10 electrons of 3d shells are filled.

## What is the highest occupied energy level?

What is it meant by the highest occupied energy level in an atom? The highest occupied energy level in an atom is the electron-containing main energy level with the highest number.

## What is the 2 8 8 rule in chemistry?

There is a 2-8-8 rule for these elements. The first shell is filled with 2 electrons, the second is filled with 8 electrons, and the third is filled with 8. You can see that sodium (Na) and magnesium (Mg) have a couple of extra electrons. They, like all atoms, want to be happy.

## Why does the second period have 8 elements?

There are 8 elements in period 2 because all those elements have electrons in the second shell and no electrons in the third shell.

## How many elements can be there in third period?

eight elementsThe third period contains eight elements: sodium, magnesium, aluminium, silicon, phosphorus, sulfur, chlorine, and argon. The first two, sodium and magnesium, are members of the s-block of the periodic table, while the others are members of the p-block.

## Can an atom make 8 bonds?

The ability to use the d subshell is what makes it possible for atoms to go beyond the octet, and it’s also why atoms up to the second period cannot do that. For that same reason, six or seven bonds are possible, and Xenon can form 8 covalent bonds in the compound XeO4!

## What element has the electron configuration of 2/8 8?

List of elements with electrons per shellZElementNo. of electrons/shell17Chlorine2, 8, 718Argon2, 8, 819Potassium2, 8, 8, 120Calcium2, 8, 8, 280 more rows